Pretty much all Super Distortions since the mid-'80s have had 4-conductor leads. The difference with the Dual Sound is that it comes with a push/pull pot to split.
Traditionally, Dual Sounds were 3C pickups – the tapping version of the regular Super Distortion, which was a 2C pickup. The Dual Sounds came with a switch, originally.
Nowadays, they are the same thing, but 4C (as is the Super Distortion anyhow), and packaged with a push-pull pot.
I am struggling to figure out what the OP wants to do. He or she wants to buy/trade...but does he or she have the pickup or does he want the pickup?