Faster version runs at 50 fps instead of 30 fps of the normal version. I do not own the real device yet so I only can test with the device emulator. Other players with real devices experimented a little game speed up with fast version. Best regards.
On a real device, it is definitely not faster unfortunately. It's still a nice little take on Pac-Man for the Playdate, but I can confirm that the fast version runs identically to the normal version on a real device.