Expansion takes place in the future, Il Mheg < Ala Mhigo

[ShinShimon]

I don't think those two places look anything alike at all.

This is presumably a few centuries to millennia after an apocalypse. Of course it isn't going to look the same. We can't even be sure that specific geographical features would look the same. But, Il Mheg is mountainous, and so is Ala Mhigo, so that renders the theory plausible at least.

Il Mheg, if anything, looks more Sharlayan than Ala Mhigan

After an apocalypse and colonization by pixies, we shouldn't expect it to look Ala Mhigan.