>>> Can anyone tell me if the swing while hitting a fast pitch softball is the same as hitting a fast pitch baseball? <<<
Hi Paul
A bat does not know whether it is being accelerated at a softball or baseball, it just reacts to forces being applied to it. Therefore, the swing mechanics that most efficiently accelerates the bat from launch around to contact is the same for both baseball and softball. I will place below a couple video clips that illustrates this further.
Men/Women From College WS
Shoulder rotation vs “Keep your Shoulder In-There”
Jack Mankin