Digital BW, The Print

Hello everybody

Can somebody please tell me whether the two MIS products (prefilled
black cartridges to go with the EPSON 1160)

a) ARC-SO20108  ("filled with archival ink") and
b) ARC-SO20108-UTK (Eboni)

are actually the same???

I use the UT/Eboni ink family for my b+w prints but should like to
reactivate my second EPSON 1160 for archival color prints and for
obvious reasons should like to stick with Eboni K. Maybe slightly off
topic, but:  Which of MIS' archival color pigs are advisable, when
black is "b". (EPSON Archival matte is my main medium).

Thanks for your info

Chatzebussi