Affiliate Marketing Secrets

Hi
Could someone explain to me the difference between the various hair colour brands of L’oreal Paris (such as Casting Creme Gloss, Preference etc.)? I’m assuming they must each fill some niche but if the only difference was that some were permenant and some were wash out, I don’t see why they would need so many and on the website it just describes how fantastic they are without giving details as to what each of them does. Also, some of them have colours that are very similar to colours found in one or two of the other brands, so it doesn’t seem like each fills a certain colour range. Could someone give me a breakdown of what each of them does that sets it out from the others?
Thanks