It has to be less abrasive, because it's designed for layered tips, including the Kamui soft tips, which a more abrasive tip tool would probably cause delamination if not used properly. If I'm not mistaken, the Kamui Gator grip implements fine metal-oxide particulates bonded to a hard stainless steel surface. Basically a much, MUCH finer version of the Williards shaper.
It greatly minimizes the chance to "grab" and lift the edges of the layers in a layered tip (known as "delamination"). And because it's based on metal-oxide particulates bonded to a metal surface, it cleans easily and doesn't "lose grains" like sandpaper does. (Note: sandpaper is as its name implies -- grains of sand bonded to paper or fabric. Because the medium -- paper/fabric -- is flexible, the bond of the grains of sand to the paper/fabric doesn't last long when they're rubbed against the material they're cutting. The glue breaks, and grains of sand tend to dislodge and fall away, leaving exposed paper/fabric in their wake. Sandpaper needs to be continually replaced because of this loss of abrasive. The Kamui Gator Grip's hard steel "backbone" doesn't flex, and thus bond-breakage is greatly minimized.)