Only ever seen pics pf L98, so can't confirm, but the following may help.
I originally started with 11 L46's about 2 years ago, 3 different sources and all sold as wild with the usual pattern of stripes.
After breeding one of the females lines became broken, and it doesnt and this broken line now appears permanent. All the other lines returned to normal.
One of the young has very irregular patterns, while other fry that have been produced after this have the regular pattern, and also the other fry from this brood have the regular pattern.
While I'll bow to Robs comments about shape, if the pattern on the fish was the usual pattern I would take it for an L46.
My thought is that if particular parents can produce 1 variation on the the adult pattern, they can produce several, and the more tank bred hypancistrus there are the more likely this is to occur.
My guess would be if they are tank bred, they are actually L46's, if not the I haven't got a clue.
Looking into it further, i got it quite wrong Look at the discussion 'what are these' to see????' how hard and confusing it is to pin an exact identitiy down without a full morphological study on the fish and comparing it to the type specimen.