Will a 400s 727 bolt up to a 440s 727?

I have a 1971 440 with a 727 transmission from a 1971 Chrysler Imperial that has lost reverse. I also have a 1977 727 transmission that sat behind a 400 in a Chrysler Newport. Will these transmissions bolt up easily or will they have different torque converters? If so can I just swap them?