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I am not sure if the axle will fit. But the problem is you have to run the same gears in the front and rear. Your 1 ton axle is more thank likely a different ratio.
Does the 3/4 ton donor have a solid front axle or an IFS? The 3/4 and 1 ton frames of like years are pretty much the same I think including the bolt holes for locating various suspension components. You need to crawl up under both vehicles with a tape measure and start measuring.
DannyP