how to make cc same colour as the skintone?

hey! im trying to recolour some slenderman tentacle CC for an alien sim i have. i dont want to go through a lengthy process by extracting his skin colour and have it be that specific swatch only, as i wanna use it on other sims too. how would i make the CC always match the skintone of the sim? i cant find any tutorials. any help would be appreciated :D