No difference between differently coded racquets, other then the fact that the S in SP is now a J in JP.
CP/CN version owns the best quality, it means china national team. yonex made for them specially. more expensive than JP version. then JP, then other version.
Actually CN/CP does not have a price techincally. The player wants to make more money, so they sell it to a dealer, then the dealer sells it for a "mark up".
yes, you are right! these are the prices for CN/CP version that i knew. TI10 OLD $520 NS7000 $250 MP100 $230