That's not the only difference. The non C version has TMR over Hall Effect, which is better (although I doubt it is noticeable in daily life). It also has gyro, which was one of the main selling points to me at that time and it can be configured with their newest iteration of software (although I had to do this in a virtual machine as it does not support Linux). And the non C version comes with a Dock too. Just wanted say that, because someone might want to buy in order save money (huge difference!), but it should be an informed decision.
There is a chart showing which of the 3 models support features. I remember it was hugely confusing when I purchased it: https://www.8bitdo.com/ultimate-2-wireless-controller/