Digital BW, The Print

Hi guys - 

I've been using the MIS-UT inkset in my 1280. I get great prints, but I have finally 
come around to the idea that I prefer matte prints to glossy (I switched to UT inks 
because I thought glossy was important to me, ironic eh?) 

So I have some of the Eboni ink, the question is - are the Eboni and Photo black 
compatible enough that I could switch the bottles and run a buncha purge patterns on 
my CIS to switch the inks over, or is it really important to have a dedicated Eboni CIS 
cart?

I'm not expecting to switch back to Photo Black anytime soon, as I've never been 
thrilled with the gloss prints, at least not when compared to really nice prints on rag-
matte paper.

Suggestions?