The page has images for PolyGerrit & GWTUI on the page. It even refers to switching back and fourth.
Though the only places that would need updating is https://www.mediawiki.org/wiki/Gerrit/Tutorial#Editing_via_the_web-interface (as creating changes is different & also to edit is different too).
Another thing all references to /admin/projects/* will have to be updated to /admin/repos/* though there are redirects in place.
All this should be done after the update though.