The neck pocket is the same width in all cases, although it is as Bagman says - a Strat heel will fit a Tele pocket, but not vice-versa.
The difference on super-wide necks is compensated by milling the heel so it'll fit a standard 2 3/16" pocket. You end up with a bit of undercut. but it's not as noticeable as you might imagine. Works out ok.
The last one I did was for a gentleman who was used to a classical concert acoustic and didn't want the feel to change much on his new Strat. It worked out ok, but in my opinion you lose a bit of what makes electrics so playable. Of course, if you watch Al DiMeola, John McLaughlin, or Paco De Luca play you wouldn't worry about any of that :icon_biggrin: