Differences between 70-72 and 73-75 dusters

The body style remains the same, right? but the front end and rear are different? Since it's bloody easy to get a 73-75, and cheaper...

and I wouldn't feel so bad cutting into one so extensively to make a serious restro-mod.

Specifically i'd focus on altering the rear to look more like a 70-72 but may get a little crazy, as for the front end that's as easy as a fender swap. I'm not too concerned over the vin and tags matching up. I'm sure some guys here have did the front clip/fender swap before. Out with it :)!