Planet catfish.com has a list of all of them. And if you look at the panaque (royal) family you can see all the different types. Some of the different species are almost identical and can only be id'd 100% based on the collection point. But the more common species are easily identified.
L-190 silvery base coat with Black stripes. Red eyes
L-191 brownish-green base with Black stripes. Less stripes than L190
L-330 basically a L-190 with spots instead of stripes