The real question is: Is knowing what all the little letters and numbers mean really important? IMHO, no. It's just marketing. It doesn't tell you what the radio is capable of, or what the radio packages come with. The real skinny on the radio can easily by found by reading its specifications at
www.futaba-rc.com, or any of the online sites that sell the radio.
The only differences between the 9CA and 9CH are some switch locations and the ratchet pawl on the throttle. Otherwise, the radios have identical capabilities.