I believe you answered your own question when you asked if they were 'the same as something different'.
No, they are different.....I'm not 100% sure, but I think Student Edition does not allow you to create your own material [to those pre-loaded] definitions, as you would need to in this case.
Design Manager Streetscape Limited
Solid Edge ST9 [MP8] Classic [x2 seats]
Greg, wood/plastic composite is typically an extruded thermoplastic (PolyVinylChloride, PolyPropelene, PolyEthylene) with wood flour or fiber mixed in as a filler. Since it is a composite and the formulas vary widely in the mixture, the mechanical properties are very specific to a particular brand/product. You would surely need to create the material your self.