Same mold for all plastics. You can see a small scratch that's on almost every Buzzz, where the mold is scratched.
I made a diagram for this mold part discussion on DGR.
This represents the Innova mold pieces in black, with the white area open for plastic injection. You can see how tiny spaces where the spacer and top/wing meet can cause flashing. Other companies use different setups, for instance many Discraft driver wings match on the lower wing, not the bottom edge.
The spacer is used to make the nose more blunt, and top match the top to the wing. They mix and match these parts so they need these nose spacers to make everything work, and in some cases affect the stability -- for instance the difference between a Sidewinder and Orion LS is just a matter of a nose spacer on the OLS that gives it a fatter, more stable nose.