The vintage Fender Jaguar's had different knobs. They are ever-so-slightly larger than the type seen on Japanese Jaguars, and have a set screw that holds it onto the pot shaft.
The Japanese reissues all have the same knobs that the Jag-Stang and I believe japanese Jazz Basses use, they don't have the screw, and instead are a little smaller, and friction fit like Strat Knobs. The same knobs are apparently used on reissue MXR effects pedals.