Gen II cables are the newest cables, different design than the old cables. There's a circular slot on the cable, to anchor the cable into the shifter, instead of a brass barrel.
http://www.iboats.com/images/telefle..._II_ob_big.gif
(Click link for cable pic)...... (I give up on trying to post a pic)
I changed over to Gen II cables when I installed a Mercury 4000 remote control, and both work fine. But honestly, the old style cables look like they are built better. The old brass barrel has WAY more contact with the shifter housing, while the GenII has little contact,,,,,, something that looks like it could eventually wear through.