They were definitely reluctant to refer to it as a Mitsubishi engine, so other than basic architecture, I don't know how much Mitsubishi content remains. Based on the article you reference, sounds like just the engine block.
The valve cover bolt pattern seems to match that of the SOHC 4G6#, so there is some commonality in the cylinder head too. BUT.... here's where it gets interesting.... the intake and exhaust sides are reversed from what you'd find on the passenger vehicle engine (or the Mazda engine it replaces). Hmmm....
FWIW, Mitsubishi Engine North America makes no mention of this engine in any of their materials.
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