Based on the description of the original courses greens and numerous articles I have read, they all said the course was completely redone. Furthermore, juxtaposing the current routing to the original Rolling Hills course, it doesn’t appear many hole corridors align.
I've probably played the old version 100 times or more. My uncle was a member and I'd spend the summers in the Oconomowoc area growing up.
Here is my summary of the renovation:
1-4 are brand new and are on newly acquired land to the west. That allowed CH to use the previous 18 hole footprint to fit the remaining 14 holes- so it gave him space.
#5 is an old hole (with greatly improved bunkering)
#6 uses an old tee and green location, but the fairway is shifted north of the creek. It's definitely a new hole b/c of that. The change gets the course away from the line of houses on the lake. I am sure they are thankful that they no longer border the right side of a par 4 anymore.
#7 is an old hole and one of the best.
#8 is a new hole. It is in a similar area as an old par 3, but CH moved the green to the East (and it is a beaut!)
#9 is an old hole- this is the uphill approach that I show in a pic.
#10 is the old #1.
#11 is a new hole. Old one was also a par 3, but he moved the green way south (away from hwy 16) and made a very nice Redan out of it.
#12 is a new hole that steals the corridor from 2 prior holes. This and 13 are in a part of the property that I'm guessing was problematic with drainage. He didn't use a lot of the old land around these and there are ponds and 2 branches of creek meandering around.
#13 is totally new.
#14 I would classify as new. It uses the corridor from the 2nd half of the old 7 and moves the tee to have a nice down hill shot over water. Hugely improved.
#15 is the old 9, just with a much wider fairway and an expanded green.
#16 is new and would be my favorite hole on the property if it weren't for the 8th. It steals the corridors from 2 prior holes and it is a really creative solution. It's probably the signature hole.
#17 is a new hole.
#18 is a new hole that combines the corridors of 2 prior holes. This is a relatively tight uphill hole that plays as a true par 4.5.