The FRCP and fiberglass reinforced nylon (FRN) materials are related, but use a different thermoplastic resin. The FRCP resin has a lower melting point than FRN, though. We've all probably seen the videos of folks toasting their FRN Spydies in the oven and fireplaces, with only minimal damage to the FRN. I'm not sure if FRCP would perform at the same level - as it would begin to melt and deform about 50-80 degrees lower temperature than FRN...
I'm basing this point on published engineering sheets from the plastics manufacturers. Spyderco may be using a different formulation for their FRCP that has a higher temperature rating - but there isn't any way of independently confirming that...
Personally - I'm a long time fan (20+ years) of Spyderco and absolutely LOVE their FRN scales. I hate to see them quickly move away from FRN to FRCP if it doesn't have the same track record of success.
TedP