The IMILAB C22 has 5MP sensor and 3K resolution, while the IMILAB C20 Pro comes with 3MP sensor and 2K resolution. That's just one of the differences I immediately saw. I think there are many more.
I bought a C22 camera. The QR Code on the bottom wont scan, Unless I switch region to Mainland China? But even then it still wont connect to my Wi-Fi 6 router. E-mails through support take days if not weeks to get a reply back if you are lucky. My last e-mail is a month old and hasn't been replied to so far. All the video I've seen looked like they are pieced together.