they may be the same engine bay ,but different looms if you want alot of heart ache and car off the road ,while you try to get a 4cylinder ecu to work on a v6 and tear your hair out trying to get a new loom which is probably worth more than the car you are trying to repair by all means fire away but i wont imagine would get any good mechanic putting his hand up for that job.
as much as the v6 is a nice engine the 240 is worth much less when you go to get rid of it.doin an gine swap on the 220 is only a days work so you can have your back on the road the next day as apposed to next year.