If Enroth is just generic pop, then I can't even imagine what Ashan is. In part 4, Enroth existed (well, it disappeared in part 4, but at least they explained why it disappeared), but Ashan's origin is completely unclear.
How does he know about Enroth!
I don't think it's worth getting too hung up on this. Both worlds are developed just enough to satisfy most fans. If you dig a little deeper, you immediately run into unexplainable questions. But I think it's impossible to create a fantasy world where no questions arise.