Also, your side yank motor, will move happily across to the green mustang, and it should have no worres, provided the white cover fits the mustang base properly.
If you do want the power plus self propelled i have here, I'd swap it for the Spare MKI diff you have there, the purple catcher, and the G3 engine once removed from the mustang base.
Let me know if you are interested, happy to negotiate if you dont want to part with something of the above (to give you an idea, the mower cost me $20, and i'd sell it for that, but as i said, I'm more for trading)