On most jazz basses, the bridge pickup is longer than the neck pickup by about an 1/8". On some squires, they are the same length. The bridge, or rear, pickup is closest to the bidge. The neck, or front, pickup is closest to the neck.
Basses: P/J F'less, MMSR4 Classic, 60th Anv P, P5, Jack Casady
Amp: ShuttleMax 9.2, FearFul 15/6/1