That's close as dammit, Sean. You win the Palme D'or!
The finish at Carnoustie was changed radically in 1931 from Braid's resdesign of 1926. When the Scottish Amateur was held there in 1930 the course finished 339, 335, 150, 365, and it was generally accepted that it was just too easy. The (British) Open was coming next year. So, the James Wright, an accountant and Captain of the Dalhousie Club (one of the several clubs whose members had and have rights over the course) decided that the finish needed to be strengthened, and compressed the 4 holes into 3, giving us the 245, 433, 444 finish we know today (the greensite of the 16th was changed by Cotton later on from a punchbowl to a convex shape). The lead in to those 3 finishing holes are Braid's, except for the fine short 13th which Wright built to replace the 17th which he had eliminated. When you add Braid's (current) 10-12 and 14-15, the back 9 at Carnoustie is really unparalleled in golfdom, IMO.
Of the other courses mentioned above that I have played, Merion's 13-18 is good, but not nearly as good. NGLA doesn't really compare.
As far as I know, tinkering with Carnoustie was all that Wright ever did vis a vis GCA. But, what tinkering!
--edited for tyops--