The differences are the amount or the concentration of oils that are in the scents. The higher the concentration of oils, the longer your scent will last, and the less you should need to apply. Are all of your products genuine?.
Moroccanoil Moisture Repair Shampoo & Conditioner 2 x 250ml
Moroccanoil Moisture Repair Shampoo/Conditioner/Duo 1000ml
Moroccanoil Moisture Repair Shampoo 1000ml
Moroccanoil Moisture Repair Shampoo 250ml
MoroccanOil Moisture Repair Shampoo 250ml & Conditioner 250ml - New