So this is interesting. Apparently the version of the shoulder map that appears during the cutscenes in the main story isn't actually a lightly modified version of the new updated version like I had assumed it was. If I'm interpreting this video correctly, it looks kinda like it might actually be the old unused version from the original release with some minor touchups.
That makes some sense. They changed a lot distant scenery to reflect that it's no longer attached to the Bionis; if it was closer to the new map, then they would've had to update it twice, depending on when they made the changes.
This way they just had to copy it from the original game and let the updated textures and engine do the rest.