My question is in the title.
With AIDA64 I have name of motherboard : Intel Skull Canyon NUC6i7KYB (2 M.2, 2 DDR4 SO-DIMM, Audio, Video, Gigabit LAN, CPU, Thunderbolt 3, WiFi)
On the box there is written NUC6i7KYK...
So what ?
NUC6i7KYK is the identifier for the entire system. NUC6i7KYB is the identifier for the board in the NUC6i7KYK system. It is perfectly normal for applications like AIDA64 to see the board identifier.
Hope this helps,