no it isnt safe to assume because you make an ass out of u and me.
But in all seriousness, it depends on the subject, level of education etc. sometimes you do see similar questions but dont go holding your breath for it.
During my last year at uni, an elective module which I had taken had a history of having questions from a certain 2 topics come up in it (thus guaranteeing an easy 2:1 minimum), so most people (including myself) revised them.
come the actual exam, only 1 topic from either subject came up and more than a 3rd of people had to resit it (I somehow scraped a 2:1 from it thus avoiding the need to resit).