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Engine and gearbox swoping

I have two K12 automatic cars, a 3 door version at 29,000 miles and a 5 door one at 75,000 miles. I plan to sell the 3 door one but before doing so would like to transfer the engine and gearboxes thereby giving the 5 door version less worn mechanicals. Would the swop be a straightforward one out one in task or would there be more involved?