Those first three are the same church, yeah. Just from different angles. Your second post where girl in white is posing, just below that building is a couple of bridges where newly weds come to take pictures right after they get married :D I remember seeing one hardcore porn flick where this very room was used for shooting. It had Wiska in it, just not sure what it was called.
Last one is St Basil's, yeah. Looking at it from behind, Kremlin to the left of it.
I think St Petersburg is just more picturesque to do photoshoot at. It's a beautiful city. Moscow isn't as impressive. I don't have any other pictures or sets to share, but I'll report back if I do come across one!