That's a great question, but not quite simple to answer. The stories I've heard, and perhaps someone can chime in to corroborate or contradict this, is that there were two maps made: The Shooting Map and the Credits Map, as you mentioned.
The Shooting Map is only seen in the movie with our heroes and it's details can only be discerned from screenshots. With that in mind, recreating the map solely using this reference is likely impossible without access to the actual production prop. (Rumor has it this is owned by Terry Gilliam.)
The Credits Map used at the very end of the movie, is supposedly the map that has been scanned and included with the Criterion Blu Ray/Special Edition release. This map can be scanned, blown up, and reviewed in higher detail, but the color is significantly different than what's seen in the Shooting Map and it's missing the script at the top of the map, as well as the clock panels on the left side (Shooting Map) let alone both sides (Credits Map).
I believe the previous replicas made are hybrids of the Shooting and Credits Maps. The replica I'm recreating will be a hybrid, with the primary basis in the Credits Map.