individual rebounding strength
You mean matchup in that position? Because to my knowledge rebounding is always C vs C (unless you set your PF to guard opponent C etc). I do not know if the matchup spot chosen is weighted differently with 3-2 compared to man2man, but rebounding skill will be multiplied with a different constant (out of the hat number 0,8 for 3-2 zone perhaps) playing outside/inside defending zones.