I think you'll have to share a bit of capx for this one.
If you're moving your sprite properly, fps shouldn't interfere with how long your animation is.
For instance, if you want to move a sprite 100px to the right in 3seconds
You should do something like:
Every tick -> Sprite: set X to self.X+100/3*dt
As dt is the time (in second) between the last and the current frame, no matter how much fps you have, after 3 secondes things should add up to 100.