I thought Oakmont went through constant changes in the early days. The story (apocryphal?) is that Fownes added bunkers every time someone hit to an advantageous spot he hadn't considered.
I think Nigel is right, that SLCC is mostly the same. They stretched out #13 (Long) some. One question is whether CBM included the biarritz swale in the green itself (hole #2), or that was done later (and if so, when?).