All the kennel names you mentioned are typically show lines and not true working lines. There isn't a way to 'tell' outright, you just have to learn which lines do what, and then specifically which individual dogs are behind certain dogs.
Here's the catch though, many breeders in the US with a focus on working or european dogs actually do use in part or in full European showlines.
The European showlines from a decade or two ago are not like the showlines of today. Each set of lines has their own advantages and disadvantages and have distinguishing characteristics. Some brave breeders have crossed show and working lines but those mixes were never very popular at least in Europe. In the US there seems to be an emerging interest in outcrossing european and american lines both show and work, whereas our working breeders here have historically often already been crossing euro show and euro work. Also be weary of title tracing - some titles in Eastern Europe have been known to have been bought off. One breeder in particular managed magically to get an IPO1 on her bitch before she got a BH. And the BH was earned on a date where the dog didn't even show up for the routine - amazing! She is luckily banned now from at least on national kennel club but she's not the only one who has managed this.
There are East European showlines, West European showlines (and amongst those German and Italian even more distinguished from the others). There are true working lines primarily from Germany, Czech Republic, Slovakia and a few from France.
There are showlines who work, but they remain show lines. This is somewhat true of American lines too. It is of course important to distinguish them from showlines bred for a steady, stable temperament and lower energy and drive, but it is also important to distinguish them from true working lines. They have different temperamental characteristics and physical traits. I can't name them all from the top of my head and of course generalisations can't apply to everyone. Sant Kreal are showlines but consistently have produced dogs who can perform in IGP work so I would be comfortable calling them working show lines. If you look at Sant Kreal Zeus for example he had an IPO3 but his parents only got their IPO or Sch1 and his grandparents as well (one grandma wasn't even titled and even including his great grandparents, he had only two with a 3 and one with a 2). I found a total of 3 offspring with an IPO3 on working-dog from him.
There are also people who spend a lot of time, money to have a dog trained and trialled to be titled, but only trialled as much as necessary to get the title, then immediately retired after they get their 1, their 2 or their 3. If you want a working dog, you will seek a dog from parents who continue to work if only to train rather than compete, on a regular basis for most of their lives. Huge difference between a dog who can work and a dog who needs to work. And a huge difference between a dog who titled because he squeaked by or a dog that earned high scores, especially in protection and tracking when it comes to IGP, although sometimes a weak or strong score can be accounted for with training, by a handler that elevates a dog or gets in the dog's way be it in training errors or handler errors.
If you don't know whether a particular line is show or work, your best bet is to ask someone who has been in the breed for a long time, long enough to see splits happen. There aren't that many european breeders left on this forum that are very active but we have one or two old timers. Mitch from Feverhaus is here and could answer a lot of questions - from what I have seen of his program he uses primarily high drive european showlines and some amount of working line, has produced versatile, drivey dogs with stable temperaments.
Be weary also to consider the sheer volume of dogs being bred. If your litters average 10 puppies, and you're breeding 10 litters a year, that's 100 puppies a year, the individuals that rise to the top might be the exception more than the norm, and so their 'best' production doesn't necessarily reflect their average production. So, even if for example you look at a pedigree and see titles behind with the same kennel name... look at the siblings of those dogs. Are several of the siblings also similarly titled or is there only one for each generation? Reading a pedigree is not just about the direct ancestors, it's also about learning to read laterally (siblings, uncles/aunts, cousins, great aunts/uncles etc.) that will often reveal things about a line that may not be immediately visible to the naked eye. This is true as much of health as it is of conformation and temperament. The mark of a great breeding program is consistency which of course is harder to gauge in programs just starting out, but look at the lines behind their foundations and see what they're consistent in, what they lack consistency in, and are those traits reflected in the dogs they are using in their program.
Example. Prinz vom Norden Stamm lived to age 13. Someone unfamiliar with his litter or breeding might assume great, healthy line, with good longevity. Then I'd tell you his sister was euthanised just shy of 2 years old due to immune system issues and skin problems so bad she stopped responding to treatment. Then I'd point out unsurprisingly similar skin issues pop up in Prinz's descendants. So was Prinz's longevity the rule, or the exception? That's all part of understanding a pedigree, knowing which dogs/characteristics are the rule, and which are the exception. What you want out of a pedigree is consistency of desirable traits, you are looking for good averages. And for negative traits you want to avoid repetition.
And then of course there's the additional issue that very popular sires that were bred very frequently to all kinds of bitches from all kinds of lines will have varying results in terms of offspring longevity and quality, and it can be hard to know what came from them as a sire, vs what came through in their dam's offspring.
Sure you can want a dog out of a bitch who lives in her teens but the parents died at 6,7 and all the littermates and siblings died between 3 and 6 of DCM, and you can cross your fingers that she didn't inherit the negative genes. But are you really stacking the odds in your favour rather than say get a dog from a bitch who lives to 8 but all the littermates made it to 9-11 and the parents made it over 10? All things to consider when researching pedigrees and dogs.
As a rule of thumb, the real, true, pure european working lines will not have any of the famous "euro" sires behind them - Gino Gomez del Citone, Fedor del Nasi, Pride of Russia Sidor, Urbano del Diamante Nero, Nitro del Rio Bianco etc. If you see these dogs then the pedigree is not pure working, and has been at least partially influenced by show lines which isn't necessarily a negative thing but it's important to know so you don't get lost and have a clearer picture of what you might be getting.
The 5 that you mentioned Diamante Nero, Citone, Grande Vinko, Rio Bianco, Sant Kreal are all showlines, some are closer to working show lines than the others but none are real working lines.
Probably a longer response than you wanted but hopefully will get you started on your research and understanding how to go about it.
