It is San Andreas. You can see the LV countryside along with Mount Chilliad, located on the SF part, which means that if it was just red county and LS, none of these would be there.
Sorry for the late response, however, I assume NFK and MikeyPI's NY mod is the "New York Mod" or "NY Mod", and the "big" one in progress is the "New York Modification".
I'm Looking For a Modeler who would like to help me make my mod i've got a few in the team so far but need a modeler if you intrested pm me and i'll give you some info about the mod