should not be a problem
you identified both axles being a dana n175, same axle housing should mean same differential. Look up the part number for the rear u joint on both trucks, and verify that the same part number is used, that should be a dirty double check that these are both going to mount the same.
I did the same for my bus, My rear axle housing is a dana/spicer s110 I looked at truck salvage rear gears for dana/spicer s110 until I found the ratio I was looking for.
You have done the same.
It is a big center section. Going to be heavy. Mine is big enough that I cannot pick up the center section. Jacks and lifts all the way.