Board Thread:Support Requests - Getting Technical/@comment-45865442-20200528201146/@comment-9605025-20200528213850

The core is supposed to be the same but there are a lot of extensions that are not necessarily the same. Even if what you are looking at is part of the core engine, Fandom is using a very older version while Wikipedia uses the very latest version. With the change to UCP, Fandom is upgrading to a much more recent version of the core program but it still isn't the newest version nor will they be matching Wikipedia's extension list.

So if this numbering trick is a function of the core program, then there is a decent chance UCP wikis will be able to do this. However, legacy wikis definitely just don't.