Sonically, the Grabber II creams the old Grabber into the ground, more bottom, more presence, midrange less cheap and nasty, fuller, better sustain. A take no prisoners rock bass with more substance than the old Grabbers ever had.
The Ripper II otoh is kind of the hifi version of the old Ripper - without being sterile. Clear, single-coilish presence without being clanky, full bass, midrange not as gung ho as on the Grabber II, more well behaved or sophisticated.