Digital BW, The Print

Hi, 

I am using MIS PKN in three channels of my Epson r1800 and eboni in another three.

By mistake I filled one bottle of ink with MIS MP-4-PK instead of RC-NTL-4-PK.  Would it be OK to add Cyan MP-4-C and/or Light Cyan MP-4-LC that I bought for My Epson 2100/200 to the MP-4--PK to make the prints cooler and, if so, in what proportions?

Would the inks work together satisfactorily.

Thanks,

Colin