Where does the new style Banks box plug in?
Is it plugged in to the MAP and rail pressure sensors? If so, it is a pressure box.
If it plugs into the MAP sensor, cam sensor, crank sensor and injector harness then it's a timing/duration box.
If it connects to all of the above, it will manipulate timing/duration and pressure.
Some timing/duration boxes can make changes with only the injector plugs and MAP sensor.
I think stacking would be fine. I ran a triple stack with my Smarty. Smarty, TST (Timing and duration) and MP-8 (pressure) with great results.