It is a new mesh (not a simple recolor). Note that the original version was not hat-compatible due to UV mapping limitations.
Reference how other creators (like pxelpink ) have used the mesh for further recolors, showing the collaborative nature of the Sims modding community. [simblob] roxy hair.package
A later version (January 2021) added hat compatibility, specular and normal maps, and all levels of detail (LODs). Components for Your "Paper" It is a new mesh (not a simple recolor)