A new, Lua based template:
https://en.wikipedia.org/wiki/Template:Url_to_diff
has been made (at my request) for teh English Wikipedia.
Given a URL like:
https://en.wikipedia.org/w/index.php?title=Wikipedia%3AVillage_pump_%28techn...
and label text (say "example")
it returns a formatted "Diff" template like:
{{diff|Wikipedia:Village pump (technical)|640631079|640620995|example}}
You may wish to import it into other Wikis.