At the minimum, the rotors will need to be re-drilled to the correct bolt pattern. The car pattern is 5x4.5 whereas the truck/Bronco pattern is 5x5.5
Undoubtedly additional machine work will need to be done to the axles and/or caliper mounting brackets.
As was said, it can be done, but it is not a simple bolt in. As for swapping in the entire rear end, it will fit, but the question is how much of a different width will it be than the front end. Plus you still have the issue of the mis-matched wheel bolt patterns.