I'll take a stab at this since no one else has yet.
I don't know what is sufficient for the application because there is no application information... Then I still probably wouldn't.
CSM, as a mat, usually has a binder that holds all the pieces together and the binder is dissolved by styrene, a product not contained in epoxy. Therefore the binder is never dissolved using epoxy and the fibers never come loose to make fitting work. There is also some sizing compatibility that causes the resin/fiber bonding to be less than designed. Stitch mat and some combination produ