Yes the cable will work. I bought that cable, when I realised the connector on the radio end would fit. I had the kit for the FX which comes with a short harness that has a connector for the SAT receiver on the other end. I had an idea as to how I might splice the two together to make a functioning harness.
Well, when I got the USA-SPEC harness, I looked at the connectors and was very surprised and pleased to see it already had the right connectors at both ends! After confirming the wiring was what I thought it should be, I crossed my fingers, plugged it in and the beast came to life.
Well at that point, I was really excited, grabbed a camera, took a picture of it working and posted it on Fresh Alloy, which is where everyone was at the time.
I've since discovered that there is one more ground connection on the Nissan harness. I actually agree with the USA-SPEC harness config, as it's got less potential for ground loops.
For those of you not around at the time, Nissan was telling us that SAT didn't work in the Murano. A week after I posted the picture, the harness became available to the dealers.
So yeah, it works, and it works fine. You don't have to buy the Nissan one, if you can get a hold of the USA-SPEC one. (But it's not that easy.)