The Burstbucker Pro is AL-V and comes in #1 and #2
These translate to #2 and #3 Burstbuckers with AL-II magnets.
Other than magnets, the pickups ON GUITARS are 100 percent identical. Same spacers, hardware, wire.. bobbins, everything.
Sold seperately, BBPro is wax potted, while BB is not wax potted.
Tone wise... The Pro has a bit more "kick" or "bite", but not really that much. Just a little more sizzle. I've got em on my 333 and LP and in Vics Tele and in mine too. They're just a little bit hotter, just a little bit more sizzly (not sparkly, but sizzly... upper upper mids)