Throwing a football is very similar to throwing a baseball. Both have an "opposite & equal", a stride with back to front weight shift, "hip & shoulder separation", a "swivel & stabilize" of the non-throwing arm, etc.
The football is heavier so the body will keep it closer and not extend the throwing arm as much. And the stride will be shorter. QB's often have to get rid of the ball quickly so overall timing will be different.
"Posture and balance" is also important as a late posture shift will often affect the quality of the spiral. House uses the spiral as an indicator accordingly.
As I understand things, Tebow used to throw off his front foot without much of a weight shift. Now he has a weight shift so he presumably can put a little more into his throws.