Generally yes with two closely related species and these.hybrids are generally sterile
With africans, this is very false.
It sucks as a consumer when you buy a juvenile that's supposed to be something and it starts to color up and it's not what you paid for.
There is going to be a time when some of these fish disappear in the wild, It'd be nice if the hobby had kept the lines pure to be re-released if the chance ever arose.
Color variation is choice driven by the females, hybridization in the wild would be a result of those females not being able to find males of their species to breed with...this "choice" is genetically driven and not readily abandoned like they are forced to in a tank.
That's all I have time for now.