Both the size variants mainly but differ in dimensions, weight, and power consumption. The 55-inch comes with 1400 x 168 x 875 mm dimensions, weighs 19.30 kgs and 140W power consumption whereas 65-inch comes with 1645 x 190 x 1000 mm dimensions, weighs 24.10 kgs and 180W power consumption. Both the variants come with a 4K Ulta HD AI display.
TCL C8 Series 4K UHD AI Android TVs are powered by Android Pie 9.0, a quad-core A55 processor, Mali470 GPU, 16 GH storage, and 2 GB RAM. Both the size variants come with 3840 x 2160 pixels resolution with a 60 Hz refresh rate. C8 series packed with Bluetooth, Wi-Fi, google assistant, 4 speakers (2x8W + 2x4W), Dolby audio, DTS, Dolby vision, google cast, google app store, google play games, google play movies, Youtube, Netflix, and many.