the short answer is yes.. I put a fender from a 76 valiant on my 73 duster.
the long answer...cosmetically the same, however.
There are some slight differences, like where the front of the fender bolts to the core support there was a notch missing from the 76 fender.
if you are looking at the front of the car, the fender slants from the hood bump downward. O \ / O kinda like that. anyway the valiant fender didn't have the point at the bottom so I had to drill a new hole in the core support to put in the last bolt..
not that big a deal but