Looking real close at that pix, it appears it has the standard two notches already that line up with the TGS. Seems the new TGS has an extra set of nubs or tits on it. Have you found anything in the new parts list? I ask you because you have some of the best research on here it seems.The tabs set into the notches and that keeps the TGS from rotating in the handlebar. If the TGS rotates you will not have any throttle.
You need the tabs and the notches in the handlebar so the TGS will operate correctly.