Should work fine, based on my experience. Be aware that Duncan and Fender use opposite polarities, so you have to account for that in your wiring when mixing those brands. Duncan uses '50s Fender polarities. Fender swapped in around 1960, and has been that way since.
Duncan provides the dimensions of their pickups. But in a move I can't understand, the diagrams for six string staggered Strat style pickups do not show the pole spread or pole-to-pole spacing.