Your question sounds a little confusing. Baby fresh water tropical fish come about in one of two ways - either the mom gives birth live (guppies, mollies) or she expels eggs (bettas, cardinals, South American cichlids, African cichlids and so on).
So mouth brooders are egg layers. How they care for the eggs after they are laid is a bit different - okay a lot different.
I guess you are asking if egg laying African cichlids that incubate eggs in their mouths would mate with egg laying non African cichlids. I would think not - I never saw it in my tanks back in the day when I had community tanks. Not saying impossible, just saying never saw it. Even WITHIN the African cichlid group, although there can be cross breeding, there are species where I never saw it. Never mind not seeing an angel breed with a neon, I have kept yellow labs and blue dolphins (both African mouth brooders) together for years and never got a cross breed.