The difference is the cone, CHR are metal cones, CHP are paper cones. Yours has mica and glassfiber reinforced paper cones, not a copper-alloy cone like the CHR drivers. The difference in response is that the metal cones have a more bright topend, due to the resonance that is less damped (but still very controlled). The paper cones sound in general more like the oldskool drivers from the 1960's and 1970's while the metal cones have a more modern sound like the legendaric Jordans.I got CHP-90 mica, and the basket is exactly the same as CHR-90.
If they use the same basket, the name CHR-90P is more appropriate than CHP-90.
I am listening to it right away and it sounds great even though it is new.
The CHR-90 was a disappointment, but I hope the CHP-90 will be as good as the MAOP.