Yeah, but no reason to get K if it shares license codes with the normal versions. It used to be 10 for normal and 10 for K, right? Now it's 5 for k and regular combined.
I think the no-letter and the K were always grouped together and the N and the KN are grouped together so for Ultimate, Ultimate K and Ultimate are together and Ultimate N and Ultimate KN are together. You can install Messenger on K and KN and Media Player on N and KN and what you'll end up with, functionally, is a no-letter version.
So, in reality, you have 10 Ultimate keys, total (used to be 20)...and 10 Professional and 10 Home Premium and 10 Starter but only 5 Home Basic because that version isn't available in Korea or the EU.
...and I forgot, 1 Enterprise which is multiple activation (100 activations is what I've read but Microsoft won't confirm) and the one Enterprise key is for all of them, no-letter, K, N and KN.