Digital BW, The Print

If I weel understand the 2 inkset have the same inks except for the EB6Y, the very light LLLK (2% ebony) that for 1400 is repleced with a neutral photo black (HP Z3100).

If this is correct I haven't understand why the photo black is not in the yellow position (so I can change from 6 to 1400 only changing one carts) but in the C position.

Can I cjange the positions (making new qtr curves) or I will find some problems with PK in Y position?

I have started to print with eboni-6  and QTR and the results are very interesting, so I'm thinking to try to have some more neutral print with eboni 1400 workflow.

Marco