Can you post a link to that camera? I went to Amazon and could not find it.
I have never heard of a CGo3 B variation.
There are black Q500 4K CGo3 (with hotshoe), White Chroma CGo3 (no hotshoe), and the CGo3+ (which will not work on Q500). If there is another variation, I would be interested, but like I said, I have never heard of it.
Note the real ID of a CGo3 is "CGo3-GB". Most sellers and general folks just refer to it as "CGo3", but there are lots of variations used in marketing. CGo3, CG03, C-Go3, etc. some with the GB added, most not. All the same camera. (Yuneec doesn't even maintain consistency in their references) .
Note some cameras have microphones, some don't, but I don't think you can tell by the model numbers. I think the cameras that came in a kit that included a Steadygrip had the microphones. At least some of the others don't.