I guess we could say, 'a UK-versus-US difference' to be complete.
Does that answer your question?
For example,
Pay raise or pay rise seems to be a UK-versus-US difference.
OR are you looking for a complete sentence like
Pay raise is used in the US and it seems like the
corresponding word in the UK is pay rise.
Is this what you want?
Let's wait for native speakers to be sure.