Is there “fairness” between different profs marks teaching same course?

If prof A and prof B teach course X, are their students marks “scaled” between each other? I guess maybe it depends on the course but i know a lot of profs write their own midterms and even finals, so for example if prof A has very hard tests for the entire class while prof B has easier tests, will the students final grades between each section be balanced around some margin or not? I know the university has a “no scaling” policy or something and profs don’t call it scaling but it still exists, right?