The KH-29T is considerably heavier, and has a slightly larger body diameter than the KAB-500kr.... the TV guided version, not the normal dumb bomb.
It also has more TNT equivilant (317kg vs. 195kg)
As suggested, the phanta and Vikhr combo seems to be better for taking out short range SAMs and AAA systems.... that and they can be used more efficiently against moving targets also.
I'll keep the TV guided weapons for Bunkers, command posts etc.