The scales are different on both maps, but in the second map they placed the vaults way too close to the NCR.
Here is an image of the new worldmap I have been working on which covers both FO1 and FO2 areas.
http://snow.prohosting.com/dacorpse/maps/F2WMN_ML.gif 2.62MB
(If you can't access this image, just copy the link and paste it in the address bar of a new browser window or tab.)
In this map I have moved some cities to their corresponding place in real life; locations found in fallout that have been moved are circled in bright green, locations not moved in bluish green, blue circles indicate the original location in FO2 of cities that were moved, Red circles are new locations I intend to put in the map.
The Necropolis is supposed to be Bakersfield according to the FO bible, if that was the case they screwed up because they put it roughly where Barstow is instead. Since I don't recall any mention or reference to Bakersfield in the actual game, I have left the Necropolis in its original place and will just assume it is Barstow and not Bakersfield.
EDIT
The size of this map is 2100x3000 pixels (6x10 tiles), the original FO2 map was 1400x1500 pixels (4x5 tiles); for this reason I moved some places like Vault City, Gecko and Broken Hills further east to get them in line with New Reno, which is now in its real location; and the NCR which I placed roughly where the original Shady Sands was placed in FO1. Vaults 13 and 15 have also been moved further away from the NCR.