7.25 to 8.25 swap

Howdy gents,

I recently picked up a 1978 Dodge Aspen slant six car for parts for my 74 duster.
I removed everything including engine, transmission, the 8.25 rear end and other various parts.

My duster has the 7.25 rear end and it is also a slant 6 car. I heard swapping out the 7.25 is easy, but does anyone have any idea if the 8.25 out of the Aspen will just bolt up, and would it be worth it. any help on the swap would be great thanks