Can a 3.2 replace a 2.7 w/ no issues?

[Lightning]

Motronic 7.2 is the ECU hardware version. There are different flash images/firmware for the Motronic 7.2 for 2.7, 3.2, and 3.4 engines. Although it might kind of work with the 2.7 program, the proper approach is to have your ECU programmed with the 3.2 firmware (requires the dealer programmer or a custom aftermarket flash program), but you won't need to change the airbox/MAF/air intake tubing; they are the same.

If you've got an '01, the most important thing to make life plug-and-play is to use an '00 or '01 S engine; otherwise you will have to swap the fuel rails off the old engine, as they changed to non-return fuel arrangement in '02...