Wow dude, yours looks like mine, I also got it at petsmart. I checked 3 petsmarts around me and most were plain looking except for him.
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I posted on here as well and was told it was a Kamfa.
How has yours been doing with food? It's been about 3 weeks for me and he's grown a good inch since I got him. He has been spitting out NLS ever since though, so I started feeding him freeze dried krill and frozen blood worms/mysis shrimp. I threw in a market shrimp the other night and he only ate about half of it before I removed it.
That picture was on black sand, and he stood out well. I switched that sand out to "beach" sand from my LFS because it is easier to clean(little smaller than gravel, not as fine as sand), and he maintained his colors. It seems that flowerhorns arent one of the fish that drastically change when on light substrate or different backgrounds (like a firemouth/convict do IME).