I'm aware these are different locations.
It has nothing to do wether a real city has "different styles" or not, it just doesn't look very homogen and lacks a coherent corporate eye. But it's your game and you seem to like it, so that's ok.
Hmm, i fail to distinguish these irregularities, Surf. Could you pinpoint them?
I see the cyborg St.Basil's cathedral, a something that looks like a crashed Thames bridge, german "Klinik" inscript... Wow, i must say, that's a lot of impressive work! What's so wrong with it?
Well, maybe except for stucco NCR walls, buldings and windows. They looks somewhat out of place, could you perhaps darken them and add some edgy knickknacks?