In my opinion, it is too hard to tell or near impossible. You described it as Wild caught, what area does it come from?? Only 1 person in Madagascar is licensed to export unless you work for a Zoo or University.
I'm also curious as to where you obtained your wild caught paratilapia.This fish is wild caught.
There are over 9 different Paratilapia species. Polleni is a large spot Paratilapia and bleekeri has never been commercially available- see BB Dr Loiselle describes quite well the confusion. The source of this fish is unlikely to be from the wild, at first look, it looks more like Paratilapia fony.I dont think it's polleni if its still small though. Because my polleni is 8" and he got alllllll very tiny sharp twinkles. So small that it cant be any smaller. I think that would be true polleni....
I'll say this one might be bleeker after comparing with my polleni fish. Or bllekerixpolleni