Whatever caliber you buy with the press, the appropriate plate will come with it. So if you buy the press with a 40 SW setup, you'll get the bigger plate. If you order the 9mm set up in the future, the quick change kit, you'll get an smaller plate in that kit along with the appropriate accessories to swap out to reload 9.
I ordered mine set up with 9, then bought the 40 quick change kit. They are two different plates although I would guess technically, you could use the 40 plate for both I wouldn't recommend it.