I doubt it very seriously; however, there are supposedly something like fifteen practically identical subspecies of oto that are sold in the aquarium hobby as the common otocinclus, and it has been suggested that some of these subspecies could have particular characteristics that deviate from "classic" oto behavior (different penchant for aggression, meaty foods, sociability, etc.). In other words, if you get an oto that doesn't behave like the traditional oto, it might be another essentially-identical subspecies.
But still, I think this is largely undeveloped theory and the answer is still a very broad "not very likely". Otos are just about as passive a fish as can be found.
pendragon!