Top to bottom, the controls appear to be labelled, Volume, Balance, Treble/Bass and Midrange. Of these, only the first and last could possibly be push-pull pots.
It is perfectly possible that no series/parallel or coil splitting options are offered. Arguably, the whole point of the dual J pickup is noise-cancellation and, perhaps, a pseudo-Stingray sound.
Of course, it would be a simple task to add mode switching.