Though I am not a fruit tree lover (more of a lustful exploiter) I think I know the answer.
I think intercompatibility exists with Plinia trunciflora as well as Plinia peruviana.
Rock in Taiwan insists that cambuca can also be grafted onto Plinia cauliflora (regular jaboticaba).
Since the taxonomy shake-up, Myrciaria is a separate genus populated only by cambui/tenella, blue jabo/vexator, guaquica, strigipes, yellow jabo...)