no they will not, the 73 up only has 2 cables and they are in different locations,
i just did this swap to my 72 demon, I put the 73 up controls and center dash bezel in (because I like the fact that the 73 up lights up) but also had to change heater box to make the cables work correctly, you will also have to change the metal plate on the front of the box, though they are the same shape the 73 up has 3 mounting studs and the 72 back has 4
