Best bet is to do a google search for the part number, try it both ways with and without the "P" in front. You'll probably get a bunch of hits on ebay, see what they came out of. But don't rely on just one or two results, ebay is notorious for listing them wrong, look at several.
These were high speed, there are others, but some changed in the 2010 - 2011 model year, like the Grand Cherokee
Liberty
Minivans
Nitro
Ram
Wrangler
What radio is in it now? If it is an RER you are fine, (The RER\RHR have an internal module) if it is any other model, (RES, REN, RBZ), AND your current radio has uConnect with the mics in the mirror, they have a separate external uConnect module. You'll also need a bypass harness for the mirror.
You'll also need to change the puck antenna on the roof. In 2010 the NAV units had a separate antenna from satellite. (there are three connectors on the back). In 2010 the roof antenna only does satellite. The RHR only has two connectors, one for AM/FM, the other does both NAV and satellite. the 2011 and up antennas are integrated to do both.
If this one falls thru and you're still interested in one - I have an RHR listed in the for-sale section, it is high speed and does work