A chip shot is meant to be a low trajectory shot with minimal spin. The goal is to get the ball on the green as soon as possible and have the ball roll to the hole just like a putt. To hit a chip shot you want to use more of an arm and shoulder swing, just like a putt, with no wrist break. The club head should never get above your hands. Ball position should be slightly back or in the middle of your stance. Try using your putting grip for chipping.
A pitch shot is meant to be a higher trajectory shot with more spin. The goal is to land the ball closer to the hole and due to the spin and higher trajectory, the ball will stop closer to the original spot at which the ball landed. To hit a pitch shot you now want to start using a more natural wrist break on your backswing. It’s almost going to feel like the start of your full swing, the goal is more of a 1/2 to 3/4 swing. The club head should get above your hands with the natural wrist break in order to help create the spin and trajectory needed for a pitch shot. Try to avoid getting too “wristy” to start the backswing on the pitch shot! Ball position should be slightly forward in your stance. Always remember to “Practice with a Purpose”