L’Oreal is YSL’s parent company so it isn’t any great surprise the formulas are identical. They even share the same perfume-y fruity taste.
Of the eight shades I purchased, only four produced opaque coverage where the others had a very sheer look. My lips are a rosy pink. They aren’t completely pale nor are they super pigmented so some of the sheerer shades were barely visible on my lips. If you have pale lips the lighter shades might work for you. If you have medium or deeply pigmented lips avoid purchasing lighter shades, it’s a waste of money, they won’t show up on you.
I find that over the course of the day, your lips will dry out. They start out as a watery, hydrating texture but begin to dry out very quickly and get drier as the day progresses. It’s the type of lip product that will make you want to rub your lips together in order to get more moisture to the area. Gloss on top may solve the problem.