I've been using on-the-spot acne treatment for more than 2 yrs. I now want to switch from on-the-spot acne treatment by Neutrogena to acne.org benzoyl peroxide because it's cheaper. Will I see any negative effects when switching? On-the-spot and it works great on my skin, but acne.org is so much cheaper. Will my skin react the same way to acne.org as on-the-spot?