User blog comment:MisterWoodhouse/The Future of Gamepedia/@comment-9605025-20201104203155/@comment-30755067-20201104205953

I don't have the answer to 2, 4, or 5.

But for 1 and 3, Fandom and Gamepedia wikis that have upgraded to UCP have the same "backend" software. Each one has some plugins that are different, for example Gamepedia has Cargo on some wikis while Fandom has SMW and Discussions, etc. Also the skin is currently different, as Fandom has the "Oasis" skin and Gamepedia has the "Hydra" skin which dictate how the pages are layed out. At the moment there's not much info on those moving forward.

But TLDR, even though they don't look the same, they are the same on the backend.