Differences should be the exhaust manifold and sump/oil pickup. These are interchangeable. Your intake manifold may also be different. The long motor itself will be identical (though I haven't checked for differences in cam profiles, however your existing cam can be swapped into the new motor without real issue)
In short, between your dead motor and the donor motor, you should (assuming you haven't had a seriously catastrophic failure) you shouldn't have any dramas putting together a new one. I would also replace the welch plugs, sump gasket (though this will be necessary to convert to the different sump) and front/rear main seals while you are doing it, as these are a pain in the arse to replace once the donk is in the car. Any other seals (such as valve cover gasket and half moon seal) which are a known pain should also be replaced at this time.
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