A brief search shows that there are at least three styles/sizes of templates available. The IBSF was offering templates for sale at one time but I can't find a sales link now. One of the sites found by the search "snooker table pocket template" claims that the WPBSF templates give the largest pockets.
the times they are a changing,,,,,, 12 or so years back I had a 10 ft snooker table I was thinking of redoing the cushions on and I could never get the info on them, maybe the templets were available but not the actual geometry, can't recall, but I was able to find the bends already shaped. I decided instead to convert it to pool rails and that was a good move. You can't play but just so much snooker in NC.