Whats the difference between the "Duncan Designed" versus the Stock Pups. Im looking at one. The 0909S/N according to Fender, had the Fender pups (Ceramic) the bass has the DD covers but that can easily be swapped out. So how does on verify Duncan Designed and what is the difference, besides alnico? Any difference in value? The 2014 version with the Fender pups is sweet... anyone?