hey
i'm not a kenwood fan therefore i don't know for sure...
but what it sounds like is that you should use the amp wire (blue/white) for the remote on the amps, and if you have a kenwood amp(???) you could hook the pink wire to it to set gains or something from the HU? I know alpine did this but in a much better way than one wire so i'm not sure.
To be sure just run a multimeter on both of them. Check for 12v+ output on all sources (cd/radio/aux) and for how long they deliver the current for. Whichever is a constant 12+ when the deck is on is the one you'll need