The Heater Deuce 95 is Heater Sports' top of the line pitching machine. It can throw real balls or real weight dimple balls up to 95 MPH. Yes, it can throw lite balls, too, but they would be even faster at the top speed.
Sorry, but we do not know how much faster. The Deuce is not a machine people normally use lite balls with - especially at the fastest speed. Typically, people only use lite balls with young children who are afraid of real balls or who need to use a machine in a more confined space - something that is certainly not typical when buying a pitching machine capable of throwing real balls up to 95 MPH.
Heater Sports' lite balls are rated at the top speed that their lite ball pitching machines throw. The 60 MPH balls correspond to the top speed of their lite ball pitching machine. The 40 MPH balls will not fly as fast at that machine's top speed.
Bottom Line: 60 MPH balls pitch faster than 40 MPH balls.