I put a sedan rear bumper on a coupe before. They are the same, of course a hatchback rear bumper will not fit but the sedan bumper will fit, I did it and it works. Look at some bumper descriptions and it will say the bumper is for the 2/4dr.
I cannot confirm it 100% From what I've seen, aftermarket custom bumpers usually say they fit both coupe/sedan (however most of the time modification is required by body shops to make them fit correctly) Having seen rear lips and rear bumpers from sedans not fit coupes and vice versa, Im concluding that it will not work. The sedan bumper seems a few inches too short for the coupe and vice/versa.