Difference between 70-71-72 dusters...

Almost everything, it's in the details & if a full list exists, I have not seen it yet.

For any 1970 model year car, there are many 'one year only' parts.

Different steering columns & the lockout parts which also affects the transmission linkage.

Different door lock parts.

Different electrical system components.

Those are a few examples. I am sure others can add more.

This is one of the reasons I stay within the 1970 model year for cars I buy now. It just makes it easier for me.