7155, 7 courses does indeed have 7 courses. As far as the game goes, it seems to be the only difference... but I didn't do a real in depth comparison.
Courses menu page 1 is the same on both carts:
6 courses (7155A) cart is like profholt82 says, the 2nd page ends at PGA West Stadium:
7 courses (7155) cart has an additonal, Sterling Shores:
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