Can I mix these two hair products together?

Products:

- John Frieda: Luxurious Volume, Bountiful Body MOUSSE
Link: http://www.johnfrieda.com/products/product_detail.asp?productLine=luxurious_volume&pid=107

- John Frieda: Luxirious Volume, Lavish Lift Root Booster
Link: http://www.johnfrieda.com/products/product_detail.asp?productLine=luxurious_volume&pid=106#/how_to_use

Is it possible to use them both on my hair at the same time.
Same time as in apply one first, then the other. Not mix them together