1) Using this Google search, the sometimes-reliable AI computer thingy has this to say:
2) There are some free sites that give you information about your bike, based on your VIN.
Entering the VIN (for my '23 C 400 GT) at either of these sites, I wanted to determine my bike's build date (which I wanted to know, regarding installing a TPMS), they both also correctly identified my bike's color:
https://bimmer.work/ (which said my bike's color was "Kallistograu Metallic (N3K)")