the newer version of the LCD is on the right, metal enclosure is shiny (like it's made from a different metal), the flex cable - different color and structure, and backlight assembly is also changed
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you're not getting it right, LCD and touch screen are 2 different parts: the newer version of LCD on a gamepad will come with the same plastic touch screen Nintendo used since day 1 (same technology as on all Nintendo 3DS/3DS XL systems). But if you get a refurbished gamepad from Nintendo, or order a replacement touch screen - it will be different, same technology, but instead it will be glass based as opposed to original plastic. As I said before it feels different to the touch, looks duller when the gamepad is off, and the glass will break and shutter if you hit it with a stylus too hard (on original plastic you'll just get a dent, and it probably won't respond correctly after that)