The pro's start with the same boots as you and me could buy. They are somtimes modded to change the boots. For example Dane Tudor used SPK Pro's last season but with a differnt front spoiler/ladder bridge. Other then doing small things like this liners and footbeds can be changes. If you put a foam liner in an SPK it can fit a narrow foot very well. Dumont just used normal SPK pro's with intution liners. Bobby and woodsy just use standard SPK's with footbeds, and douglas uses Ghosts with intutions.
So as you can see for the most parts boots are pretty much standard for pro's too, they just get them well fitted.