Chances are good the axle is wider where the wheels mount than what you have, making for a wider stance.
If you've checked that and it's not a problem, or you're not worried about that anyhow then it will fit or can be made to fit.
If by chance one of you measured wrong and the spring pad center distance is not the same it's not the end of the world if you have to relocate them.

Have you researched and shopped for a GM 14 bolt rear axle? In my opinion they make a great swap for a 1 ton axle, cheap, easy to work on and get parts, and good selection of gear ratios.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-