Punching Pads

Newbie question, I got these 2 punching pads in 2 different leathercraft kits... they both seem very different. the white one is harder and more plastic. The clear one is more like rubber and much softer. Can someone please explain the use of each one of these. I can't image even tho they have the same name that they're used for the same thing. Thanks so much in advance! :)

https://preview.redd.it/b1tdtbkmbedf1.png?width=1998&format=png&auto=webp&s=9593d18bae6ca8662103bb83dcf9f14d21d60b20