I assume the big issue with any other engine is that it affects the transmission mounting. Changing the transmission affects the transfer case. Together all of this could affect the overall gearing of the vehicle.
But with that said, I believe non-US versions of the HMMWV may have different engines, transmissions and transfer cases sourced from their respective countries.
I don´t think so; overhere in Europe, the Humvee dealers source vehicles from all over the world, and every non-US Humvee I´ve stumbled upon so far (Denmark, Poland, Luxemburg, Spain, even Africa) had the same good old 8-cylinder GM/GEP diesel, either 6.2, 6.5, NA or turbo, the 3L80 or 4L80 transmission, and either the NP218 or NP242 transfer.
Now there are a few "Humvee lookalikes" around the world, that at first glance seem close to a Humvee. Spain comes to mind with their URO Vamtac, but that one has a totally different construction, and a 6-cylinder engine.
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