Yeah it's tricky.I have had some with the reddish brown bellies as well as white bellies even green. I never have had any issue's with different colored bellied individual's breeding.But I really dont know the exact locals of my cepediana.They could very well be mixes of both local's or just variation within one local.This wont help much but is has been my experiance regarding cepediana morph's.Some people have said they wont interbreed so this kinda lead me tward's variation within type locality.
goodluck