Just the routing plans:
1920 Routing
After Colt's changes in 1928; the famous routing is in place.
A comparison
I believe Gil Hanse must have used the top two routing plans for his drawing and then scaled accordingly. Because the dates are the same and the yardages are too. (But there are some differences in the bunkers between Gil Hanse's drawing and the top two).
So Colt doesn't change the shape of 7,8,9 very much, although it does look like he changes the green size and bunkers if you compare the top two plans.
The remaining 15 are completely different.
Overall I think the current course looks faithful to Colt's design but with obviously fewer bunkers and without Simpson's famous bunker at the 9th.