Orange hypo x orange hypo breeding can produce orange, butterscotch, gray, yellow, peach, ect. Some people selectively breed for a certain tint of color. Some people didn't and now we have *insert color* ghost that isn't even that color. Their all the same morph, some came from different wild caught animals, some didn't.
From putting together all I could, there appears to be different lines of green, some compatible, some not. Blue ghost is the one I've herd is not compatible (unless someone has information from someone who has tired it?). also desert ghost is not compatible.
Most of whats out there is all compatible. Pick out something you like, I wouldn't worry about the supposed color attached to the name, it's like worry what line of pastel you have.