I know others have chimed in, but I have both a Soumak scarf and just got the Spitak crew in the mail. They're pretty much the same kind of fabric/weave, so the Kaghak cardigan should also be the same fabric as the Soumak and Spitak.
The other correlations for scarf/sweater/cardi in same fabrics would be :
miro / tashir / ??
soumak / spitak / kaghak
?? / sisian / ijevan
Some stockists are using the wrong names for the types also (OC comes to mind off the top of my head; they have a sisian sweater labeled as a spitak iirc)