Hitler never was all too happy with Operation Citadel and when Hitler was OPPOSED to an offensive, it meant something considering he was usually the first to push for a new offensive. He had a bad feeling about it.
So let's say Hitler cancels it altogether and orders powerful defences to be built up around the Kursk Bulge instead to counter the anticipated Soviet offensive and sits tight. Stalin gets impatient as the expected German offensive doesn't come and orders a summer offensive to take place in the Kursk region which is the obvious location for such an offensive.
A reverse Kursk results in summer 1943 in which the USSR suffers heavy casualties. The Red Army won't launch another offensive until winter 1943/'44 which frees some divisions for service in Italy to slow the Allies down.
Germany still loses even if it takes a few months longer. There might, however, not be a Soviet occupational zone because of their additional losses and subsequent slower advance.