You don't strictly need git for it.

In Switzerland, at least at the federal level, and since 2020, laws are created in HTML too. You can compare between versions as well as languages.

Swiss Constitution, under "Tools" click on "Version comparison" - https://www.fedlex.admin.ch/eli/cc/1999/404/en

I tired to do something similar, it's somewhat okay (In german)

https://shadowofthepit.github.io/Projekt-Gesetzvergleich/Bun...