Are XxxCH/CJ/CK and XxxxH/J/K series TV models the same?

The specifications and features of the XxxCH/CJ/CK and XxxxH/J/K TV models are the same.

The difference in the model numbers is based on the type of store they are sold in, and their warranty terms.   

For example, the KD-65X75CH or KD-65X80CJ is the same as the KD-65X750H  or KD-65X80J, but the models KD-65X75CH or KD-65X80CJ is sold at membership-only clubs, such as Costco.

Please check the documentation that came with your TV model for its warranty terms.