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Hi Anish, Thank you for the inquiry! The main differences between the X75K and X750H are the year model and sound processing. The X75K is 2022 model and KD55X750H is 2020 model. The X75K will more likely to get future software updates which improves the functionality and features of the TV. The X75K also has better sound processing, it supports DTS HD that can provide up to 7.1 audio channels for home theater use. Visit our Sony support website for more information. Regards, David
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