Classic auto air install:will 72 duster heater controls fit 73 dash ????????

I'm no totally familiar with every a-body dash and climate controller. I know a hand full of them.
The most obvious change is the fan switch, 73 and later moves left/right, pre 73 moves up/down.
And of course the finish bezel difference is obvious.
Less obvious is the opening in the metal dash. Mounting holes for the controller/bezel moved.
Then the controllers... pre 73 heat only were all mechanical cable to blend door operation.
I'm pretty sure all 73 and later were a mix of vacuum and mechanical door operation.
Where there is a vacuum switch block, fan off wiring is on that switch block also. That left/right fan switch served no less than low speed. Where there was no vacuum switch block, the up/down fan switch did go to off. So... just look at the displays, notice where "OFF" is placed.