Adding Smartkey to existing Prius II

I've searched around quite a bit, and found someone saying I can just add the sensors and SKS ecu and it will work. I don't see a stand alone SKS ecu, so my question is, does the standard ecu have the firmware ready for it? Can I just add the key switch and sensors to the empty pins if I can find the pin location on a pin out diagram? Does my fob already include an RF print inside to be recognized after programming?