The infield plays closer to the plate since bunting is much more frequent in fastpitch. A play in fastpitch softball is completed much quicker than in baseball. The pitching is very difficult to hit. A no hitter happens more frequent then in baseball. Okay, you may throw one or two fastballs in a game, but at the risk of a batter taking you downtown.
Many pitchers never throw a straight fastball.
The riser is a fastpitch softball unique pitch. There is no equivalent pitch in baseball. A good riseball has a full backspin and will jump up just prior to reaching the plate. The ball is larger and has larger seams which result in a pitch that breaks more sharply. The drop is also a great pitch.