Sorry i understood it as no differences only minor not mentionable.
I have a r32,r33 and a ceffy currently, i have changed between all these turbos mentioned, and from my experience i believe the nylon wheel does come on much faster and pulls harder.
And i said near 500rpm.
i have had this conversation with a reputable Turbo dealer here who says same thing.
Also having a non tuned rb20 stock ecu running 13psi with a sII turbo making 197rwkw says something aswell, when all the s1 with same mods make around 180-185.
My 2 cents not having ago, just saying what i have experienced, and i dont think Nissan just changed to nylon for no reason.