Digital BW, The Print

I am just a bit confused by MIS's terminology regarding "Eboni" carts 
for the Epson 2200.  Is the MIS "Ultra Chrome Equivalent" Eboni the 
same as the "Ultratone" Eboni?

I am planning to experiment with the Eboni that folks say gives such 
great matte blacks.  So which Eboni cart should I order?

ARC-T0348-K (the Ultra Chrome Equivalent) or,
ARC-T0347-QUT (the Ultratone) or,
something else??

Thanks,

Kiefer Elliott
Vancouver, Canada