User blog comment:DeltaWolf247/GTA V Map Confirmed/@comment-4095569-20130910220149/@comment-4095569-20130910221638

I don't know anymore, looking at some ingame screenshot it looks like it fits to some degree (It wasn't that thorough).

I doubt the maps are the right scale though. According to the comparison, the airport is roughly the same size as Algonquin and there are beaches larger than Bohan as well as your normal roads being the same size as a highway in Liberty City.