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I thought the 06 Grand Cherokee diesel was a Mercedes engine and of course we know the 14 diesel is a VM Moroti engine. Turns out VM Morori made both, just under different owners.

VM Motori - Wikipedia, the free encyclopedia

Short but interesting read on Wiki.

 

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Are they the same engine though? Ostensibly I would say many of the tuners and what not would be cross compatible if yes...

No, the 3.0l is brand new.