Unity. Different interface versions for different platforms

There is a rather large project on Unity, in which there are many different UI windows, elements. There was a problem with two versions of the interface (one for PC, one for phones). How in this case to organize all this? I think divided into scenes: Init (manager initializer), Core (all game managers), UI_Win, UI_Mobile. Only with the full independence of all these scenes. Do I have the right thoughts? Or can it be split into one UI window by one scene: (Scenes / UI_Mobile / AuthScene, SettingsScene)? Which option is preferable? Or there are other options you have.

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