The 2011 Blu-ray grain is mostly fake grain, so it doesn’t really represent the films as they would normally appear. Nevertheless, the negatives would still have quite a bit of natural film grain – less than the 4Kxx projects, but maybe only slightly less than 4K83. The real odd-looking ones are the UHD’s. The only significant grain to be found on them is frozen grain.
I’ve heard of Blu-ray releases “de-graining” old films, but I’ve never heard of adding fake grain. Why would they do that?