probably. whatever they did, its probably some proprietary vox thing. might have some wild logic in it.
MAKO amps use RJ45 connectors for their footswitch on at least 1 product, mainly because the cables are cheap & easy to buy (normal LAN cables) rather than 8pin DIN connector cables.
It wouldn't surprise me if Vox made it so you had to use their own footswitches with it. Hard to tell without more info.