Oscellaris or Perc?

[Delphinus]

Sorry dude there's no way to tell from those pics.

One trick people have been using is to look at the eye, if the eye ring is clear or orange, the fish is percula; if the eye ring is "muddy" or dark then the fish is ocellaris (note the spelling btw- the only "s" is at the end )

I'm not certain if it's a 100% foolproof ID method, but that's what people claim to use with success. Good luck, hope this info helps.