according to pooldawgs durometer measure
g2 soft 74.8
kamui black soft 72.3
so the kamui black is ALITTLE softer
i used to play with kamui black softs for years
but got tired of the glazing
i use the g2 soft now for years and would never go back to kamui
they (g2 soft) are soft /grip the cue ball great/ hold chalk great/
after the first shaping for alittle mushrooming which i found was worse with kamui
they also hold shape great
best advice you will get is put one of each on 2 different shafts and try them both out
otherwise just buy the g2 and BE HAPPY...