Hasselblad provided two types of cords, that were called SK and FK; easily remembered as Side connector and Front connector.
The cords with the DIN-plug are for the side, the one with the jack plug in the front.
Hasselblad EL cameras have two holes for release buttons on the front: one occupied by the release button the other one free. So you could leave the button in and use the other for an FK cable.
Only when the cameras were supplied with the - not so good - bigger, square release button, you wouldn't see the two plug holes, and you needed to remove the release plate to be able to use an FK cable.
The ELD still has the same two holes on the front, but only one can be used to trigger the camers, the other being wired to trigger the camera when there's a digital back on it.