Axle change?

I looking at a 64 fury rear axle and I'm wondering the axle shafts have a nut at the end that holds on the wheel hub but still have the normal 5 bolts at the bearings can I change out the old axle shafts for solid new ones like mosier axles this is a 8 3/4;axle I'm referring to and basically want to know if the axles were the same length could they be swapped out I have a completely different center section with a sure grip/ gears and my spline count is this possible?