HELP!!!! Girls make up advice?

Im shopping for neutrogena coverup for my boyfriend little sister because she has really bad acne and always puts alot of cover up on so i want to get her something more healthy for her skin i know she wears Beige coverup but neutrogena has so many diff types like warm beige, honey beige, med beige, natural beige etc...anyways what are the diffrence in these? i cant figure it out they all look the same to me btw im shopping online cuz its cheaper...i want a liquid cover up and a powder cover up also any advice? thanks so much