Digital BW, The Print

I decided to dedicate a Stylus 1290 to BW.
I hesitated between piezo and BO printing with MIS museum black,
I finally ordered piezography K6 CIS kit.
But I would like also to try BO, so my question is:

can I try BO printing with the black (shade 1) of K6?

Is MIS museum black darker than the black from K6?

If MIS museum black is darker, can I replace shade 1 of K6 by MIS 
museum black and use it for BO printing and piezo printing (with the 5
others piezo inks)?
Thanx