Almost any heroine cichlid can hybridize with another of the tribe Heroini (maybe even other tribes). I have seen pics of Australoheros species from Uruguay, mate with convict types from Central America, and create viable fry.
Mesoheros could possibly mate with Herichthys (not that its a good thing) but a possibility given certain conditions were right.
When you consider that DNA sequencing has tracked the ancestors of many Central American cichlids to a northward colonization by their South American ancestors, (the original ancestors of Mesoheros) and that those cichlids radiated (some as far as Texas) to become all the different Vieja, Herichthys thru evolution over millions of years, etc. Anything is possible