I'm in the same boat. Just got a used SE DGT (which I'm loving) and want to swap the order of the volume pots too. From your post it seems are you looking to replace the volume pots. If so, why?
For the tone pull pot, PRS sells a $22.00 "direct replacement". Not sure what their "custom taper" is, but most people use a linear taper pot for tone positions (audio or "logarithmic" taper for volumes). I've seen them for less $$, but this should certainly work. It looks like a 500k 3/4" bushing DPDT pot, which are sold by many parts vendors.
PRS Original Parts - Designed by PRS with a custom taper, this 500k push/pull tone pot allows coil-splitting in the tone position and includes mounting hardware. Only compatible with pickups configured for coil-splitting. Acts as a direct replacement.
us.prsaccessories.com
Volume pots are also probably 500K audio tapers, but without removing one I can't tell the bushing length.
PRS also sells replacement volume pots:
PRS Original Parts - Designed by PRS with a custom taper, this 500k/.022mf capacitor tone pot Includes mounting hardware, and a direct replacement for all PRS guitars. (ACC-4109)
us.prsaccessories.com
In addition to switching the order of the vol pots, I'd like to replace them with individual pull pots. I like to be able to coil tap individual pickups for either blending in the middle selector position or for switching between rhythm on one pup and lead on the other.