Digital BW, The Print

I am a little bit confused here.

I have ordered and received an inkset from MIS for an Epson 2000P.
The inkset is FSNEK6-4. It is listed as containing UTFSN C,M,C,M,Y,K.
The actual ink bottles are labelled as UTFSN-4-C,LC,M,LM,Y,K.

So what do I have and which curve should I use. I looks to me as if it has the 4 tone inkset, CMCMYK, but the bottles are labelled according to the positions that you fill them in.

So I imagine that the UTFS Curves for the appropriate paper would be right.

Can anyone confirm this?

Cheers
Greg