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Slight clarification. Any OB peacock is a hybrid. There are naturally occuring, non-hybrid morphs of various species of mbuna.
Yes, they can live in the same tank. As for "is there more than one", well, that's kind of an open question. I'm not sure how many or which Aulonocara and mbuna species were used to create the hybrids. It is quite possible that multiple species of each were used to create multiple OB peacock strains. But, bein' hybrids, OB peacocks are not true species. So, askin' if there are different OB peacocks isn't the same as askin' if there are different species of mbuna or pure-blood peacocks.