I’m not gonna go out and say I’m 100% sure, but the editor videos I’ve seen feature an exclusion zone polygon around scenery objects that are replaced, so if everything works they way they are supposed to, it should work. I got the freeware Tower of London and Buckingham palace manually installed myself (default looks horrible), we’ll know for 100% certainty in a few days.
The stuff they put in may be better than the 3D google maps freeware stuff, but i don’t certain about the OrbX stuff.