Ashark [1] filed a deletion request for kde-servicemenus-komparemenu [2]: Abandoned (author is not active, last update in 2017). The link is not to any custom service menu, but a redirect to the application. And currently, this servicemenu (kompare files) is available by default.
[1] https://aur.archlinux.org/account/Ashark/ [2] https://aur.archlinux.org/pkgbase/kde-servicemenus-komparemenu/
