Hi!
Well To me you have a probable species of Lasiancistrus ( because of the heatd shpae), could be an Ancistrus... but it look like he is pretty flat and long head to be an Ancistrus (maybe it is the pic that does that) Possibly L178 L68
THe other one is a species of Peckoltia or Hemiancistrus, or maybe a Guianancistrus but for sure all are still undescribed...
Possible L number: L122
Under what name did you buy them?
Cheers
Yann