While there is no disputing Windows copy heavily from the Mac UI, the actual feel of that interface was also strongly influenced by the IBM Common User Access (CUA).

https://en.wikipedia.org/wiki/IBM_Common_User_Access

Not only did Windows try to follow those CUA rules, Microsoft encouraged Windows applications to also follow those rules.

That meant that from a user perspective, the Windows experience was fairly consistent irrespective of which application was being used.