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Hi Hummerman, Thank you for the inquiry! The difference in the model numbers is based on the type of store they are sold in, and their warranty terms. For example, the XR77A80CK is the same as the XR77A80K, but the models XR77A80CK is sold at membership-only clubs, such as Costco. Please check the documentation that came with your TV model for its warranty terms. Hope this helps! Jay
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