Big Sur related app updates on Catalina
Hi,
I'm running macOS Catalina and don't want to update to Big Sur due to not liking new design approach. However, some apps (like Twitter, Pages, iMovie, etc.) have received updates on the App Store dedicated to Big Sur, claiming to have refined new design on macOS Big Sur and new icons as well.
My question is following: if I'd update those apps, would their UI be changed even on Catalina as well or would they only get updated looks on Big Sur? So that I'd just get bug fixes and new features, but not design change.
Also what about app icons? Would those be changed as well? That I don't really care about as I could just change them back myself, but still.