There are clearly at least two different species in this lot. I can't see ANY that are saying "I'm a Peckoltia" in my view, and I'm 99% sure none of the fish are actualy Peckoltia vittata, and my feeling (but I can't say for sure, as, unfortunately, the pictures showing clear distinctions are hard to say which is which fish. I know that some shops/wholesalers/exporters incorrectly call fish "Peckoltia vittata" based on the mis-labelling of a picture of Panoqolus maccus as "Peckoltia vittata" in Mergus Aquarium Fish Atlas Vol 1 (or 2?) [and of course, since some book writers often use other books for reference when writing their books, the misidentifications get propagated from one place to another].
I'm not entirely sure the smaller ones with brown body and lighter colour are proper
either - the paired fins look wrong.
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Mats