I've not (yet) played the course, but in Finegan's book he mentions a conversation with the late owner, Moira Fabes, in 1998 which implies she tried to restore much of Abercromby's original design.
The paragraph is:
"In her office Mrs. Fabes reviewed a large map of the course for my benefit, pointing out the several bridges over ravines and warning me to be careful of the wooden planks, which local children sometimes loosened out of devilment. She traced Abercromby's career from when he got into golf course architecture till he got out. The chairman who preceded her in office was, she believed, misguided. "He thought he knew more about golf course architecture than Aber," she said disdainfully, "and as a result undertook many revisions. I undid his changes, and the course today is just as Aber made it."
Maybe this is why your overheads are so similar?