The case taper of the 9 mm is much greater than that of the .38 Super. I'd expect changing the neck expansion die and seating die adjustments between loading sessions-even if it would work-would be a significant pain in the butt. Maybe if shims could be made and you used standard lock rings you could make it less painful, but you'd still be better off with a different dies set & tool head.

Those loading 9mm with other press systems would be well advised to set up your dies using a .38 Super shell holder. The 9mm seems to have some wide variances in rim diameter and a close tolerance shell holder can cause grief. Before anyone asks, the shell holders don't seem to be interchangeable.