Yes. as I found out a few months back short of some sort of provenance back to a specific collection location in the wild, the most accurate description is P. polleni "aquarium strain".
BTW - I have a single male polleni in a 125, along with a mixed group of smaller CA fish that can hold their own (or he has grown to accept?) - and he does just fine. In fact he's very outgoing, never hides, and is overall just as aggressive as some of the larger CA cichlids that I own. From what I have seen in other set ups, and experienced in my tank, how well they do in groups or individually depends on the fish, size of tank, decor, tank mates, etc. Pretty much like any other cichlid.