Since there was a 3.0 24V KE-Jet, would it be possible to do this?

Is there a difference between the 12V KE-Jet and 24V KE-Jet?
Are there any differences block/head between the 3.0L M104 and 2.8/3.2L M104 excluding the obvious displacement.

Just trying to see if it would be an easy swap for my M103 if I could find a junk 104, rebuild it, then simply remove the engine and swap it. Swapping the ignition + fuel system over sounds like a potential nightmare...

I looked into the 3.6L M103, but have been dissuaded based on the information that it has had a lot of issues and the longevity is very poor.

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2016 Monsoon Gray Audi Allroad - 21k
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2003 Gray Mercedes ML350 - 122k