Yup, same thing. It can be a bit trickier since you need to put your knee on the tail instead of using your foot. The other bit that's tougher is you can't get the speed you can get on a stand up. Makes it harder to get deeper so you tend to get a bit more worked. But anyway, waves that are perfect for bodyboarding (for me, anyways) tend to break in 6-12 inches of water so duckdiving is a moot point!
