My hunch is that the Vanson tuners are made by Jin Ho in Korea. I say this because their part numbers are oddly similar to Jin Ho part numbers (Vanson =V07SP, Jin Ho = JN07SP) and the drawings are identical (first one is Vanson, second is Jin Ho) and Jin Ho makes tuners for many private labels. Now, according to John Mann's website, the SE tuners are made by Jin Ho so I would have expected them to line up, although it's entirely possible PRS spec'd a different mounting pattern, or Jin Ho has several patterns, or the Vansons are just machined differently. Or I guess PRS could have changed suppliers at some point. Notice that the drawings below tell you the "envelope dimensions" of the part, but they don't actually specify exactly where the screw hole is relative to the post. Most higher end tuning machine drawings either would show 7.8mm X, 7.8mm Y from the peg center, or show 11mm at 45 degrees. From the Vanson/Jin Ho drawings, there's really no way to tell if the screw hole would line up, or where it is relative to peg center.
Thanks for sharing this. I was considering buying private label Jin Ho locking tuners and would also have been disappointed if they didn't line up properly.