That is what I tested as jumpers - 0.5m Diamondback interconnects.
On the face of it, the construction appears similar between the dedicated AQ jumpers and the AQ Diamondback/King Cobra interconnects, they use similar solid wires in PE air tubes (PSC for Diamondbacks or PSC+ for jumpers and King Cobras).
But there are structural differences and those differences apparently matter for sound. First of all the interconnects have several wires in a twisted configuration (jumpers only require and have one wire). Second the interconnects are shielded with a drain wire, I believe the jumpers are not. Last but perhaps most important, the RCA connectors on the interconnects are silver plated and cold welded to the wires - both features shared with AQ's best interconnects. Compare this to the more standard gold plated RCA jacks on the dedicated jumpers which are the same style used on AQ's entry level wires. I am thinking the shielding, connectors and termination all contribute to the greater perceived performance of the Diamondbacks used as jumpers compared to AQ's dedicated product, even though the jumpers use slightly more exotic copper formula.
Makes me wonder if the dealers you talked to actually compared them by listening...