1972 demon vs duster.

Doors? I believe?

Entire front clip will swap, but then you will have a "73 look alike" beak nose, etc Aren't the bumpers different? Energy absorbing in 73?
70 to 72 doors are metal tops, 73+ have the plastic trim. The inner door handle assembly is completely different. So is say negatory on the doors

Oil can energy absorbers started in 74 although not all 74s have them