CFT is just another name for the resin added to the urethane cover. Friction can be obtained by the tecture of the surface, or the chemical composition. Pure urethane gets it friction from the coarseness of the surface. Resin enhanced urethane gets added friction on the dry from the chemical resin additive.
Trust me, nobody is making Epoxy balls under any name. Cost prohibitive, considering the incrementally small, if any, enhanced performance available from an epoxy compound. Also, remember epoxy simply describes hardening process the material, not what it is. Epoxies have a hardening agent that chemically reacts with the base compound to enhance the hardening.
One of the first urethane lane finishes clear back in the 70's was an epoxy (astrolane from Brunswick ). All that meant was that a hardener was added that chemically hardened the underlying urethane. It lost favor back then because it was extremely difficult to work with due to the short drying time.