Apples and oranges. The Tortoise switch machine is just the actuator that moves the switch rails. The Fastrack switch is the whole switch, including the switch machine.
The short answer is no.
If you're thinking of using the tortise switch machine on a Fastrack switch, I suppose anything's possible if you have enough time and the inclination, but it's not the first thing that comes to my mind. Once you get them working, the Fastrack switch is pretty reliable, I don't see the gain in replacing just the switch machine parts.