I believe they are very different. They are about as similar as Paperclipped is to the card to ringbox. Let's break it down into effect and method.
Similarity in Effect: Both effects are predictions clipped in full sight from the beginning of the trick. The clipped card ends up being the clipped card.
Difference in Effect: Bulldog must be performed with at least 2 predicted cards. One card ends up being the signed card and the other ends up being just a prediction. Paperclipped really needs to use a single prediction. I can't see how you would use two predictions without significantly changing the handling.
Similarity in Method: Both are an open prediction and billet switch.
Difference in Method: The specific mechanics of the switch are completely new. At the end of the effect, you can lay out everything on the table very cleanly. With Paperclipped you have to ditch something in your pocket in order for the switch to work. In Bulldog, you don't need to ditch anything (the signed card and clip are completely examinable).
Answered at 10:17am on January 8th, 2019 by joshburch (215 karma)