My 2 cents:
Presumably the geography wouldn't have developed the same in both universes. So like, a magical city might pop up in a tract of corn fields in Kansas.

Races with magic wouldn't have had the same motivation to develop technology, so we might have technological abilities that are as mind-blowing to them as their magic is to us. Or they might find some of it really horrifying, like large scale farms with cows on milking machines would seem like bizarre alien stuff to them.