When they break/crack and people see the strands, the majority assume its fiberglass. SMC is similar to fiberglass in the way it is composed of resin and strands of fiber, but it is not fiberglass. SMC uses much longer stands and it is set in a different resin that gives it much different characteristics than fiberglass has. Compare the bottom side of your stock hood to the bottomside of a true fiberglass hood, SMC resin cures with a much smoother straighter top/bottom then fiberglass does. SMC is also lighter and more rigid then the same thickness of fiberglass. It also does not deform and shrink with age like fiberglass does.
If its an OEM part made in the last 20-25 years, and it looks like fiberglass, its almost always going to be SMC. Fiberglass is old school and is not the most suitable material for anything in the automotive world, except making lightweight racecar parts. Our 94-98 cars have a SMC hood, headlight mount panel, side scoops, Apillar trim, Sail panel covers, and the license plate surround. 99-04 cars even had a complete SMC decklid.
The repair process is fairly similar, depending on what youre repairing. You most definitely need to use SMC specific products for a correct repair. The idea behind repairing SMC is to retain as much of the damaged pieces as possible, and use the specific epoxies to fill in the areas that "cracked out".