Yeah lots of gear passed along
I think both are very different (although some claim both are for bass, I dont share that opinion).
To me CP622B is on another lvl when it comes to detail and imaging. The bass is nice, but to my ears not in the ballpark of the GM.
The GM does not have the details of the 622B, but better bass texture, decay and depth.
Both quite chonkyw IEM’s, that can be awkward to the ears. Which is why I dont keep them.
Both are great, but to my ears are different. And to my preference the CP622B wins (even though Im a bass lover).
The details and imaging put a smile on my face every time.