Agathos,
The problem is that both species have been reported to have 10 dorsal spines, so unless the fish has nine (your's has ten in the last photo) you can't be positive that its a perc. The top fish in the first picture almost looks like it has eleven spines.
And then, Is that a misbar on the one fish's left side? That might mean its tank raised, and coloration will be even less of an identifying trait in those fish. Personally, I ignore coloration anyway (too variable) and use where the fish was collected combined with the dorsal spine count (unless it is 10) to figure out which fish I'm looking at.
Jay