They're the same, just have different mounting slots. You connect them by wiring them to the electronic of the guitar, there is no real difference in sound, just in the way you mont them onto the guitar.
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They're voiced a bit differently, and the bridge pickup spaces the poles a bit wider to accommodate the wider spaces between the strings at the bridge.
there the exact same pup but one has wider spaced poles to accomadate for a trem.
Gibson SG Faded
Epi VJ Stack

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They stopped asking
thanks guys, much appreciated
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the left one has normal string spacing. the right one is a trembucker, an f-spaced pickup.
Ibanez RG321MH (Air Classic/Tone Zone)
Fernandes Telecaster (Twang King/stock bridge pickup)
Blackstar HT-20 (Scumback 55 speaker/ Tung Sol tubes)
TC Electronic Nova Repeater
Lava Cables Clear Connect, Soar and Mini ELC