If more then one has the same name
That's simply impossible; you can't have two (or more) files with exactly the same name in a folder/directory...
Just loaded the sd card into windows opened Garmin folder and the maps are listed as New England Topo- NY Topo 24k. The maps are actually Maine Topo(from gps file depo ) and a portion of Garmin's 24k N/E CD. The sd card is 8GB, would it be simpler to just load the whole N/E 24k cd and the Maine Topo if there is room?