Transmission is different, so, no, from that perspective, it is not a plug and play. 3.6L didn't come out until 2012, so there are most likely other engine management issues that would need to be addresses as well (wiring harnesses, sensors, etc)
"Running into it" as in using another vehicle to run into the back of the Journey? If so, it is probably damaged now and will need to take it to a body shop to see if they can open it...not the brightest idea I've ever heard ....