Hello, it's very difficult, to say the least, as for starts, plants grown from seeds may vary a lot from the mother. You can find particular similarities as they grow, and shorten your list, certainly not from just look at it you can tell the precise variety, unless you got a named clone to compare with. There are very distinctive flavours in each strain that may help to identify it, but there are different phenotypes too, also may differ with just the grown patterns, and so on. It's like get a bunch of stray cats together for a year, separate them, and then find which belongs to the same family.