>Can someone tell me if there is any difference between UT7-Ebony K
> and K4-K,
All MIS Eboni matte black is the same. It's used in all of the inksets.
Beware of "universal" black that MIS sometimes labels "MK".
> between UT7-PK and K4-PK ?
There is a difference. Modern printers -- since about the R220 -- do better
with a lower load PK. K4-PK is optimized for the newest printers. The MP
and 7600 PKs are aimed at K2 and older printers.
Paul
www.PaulRoark.com