I wouldn't worry much about the stroke if the new one is the same or longer than the original. You should be able to fine-tune/tweak that with the linkage adjustment at the pedal rod, so the pedal hits the floor before you bottom out the clutch and/or slave cylinders. Or if you don't want the pedal to go that low, add a stop to the pedal arm that'll hit the floor before any damage can be done.
If its shorter, of course may run out of travel before the clutch cylinder releases the clutch.
May take some fiddling, but I bet it can be done! Easy to say when its someone else's car!!
Good luck; and be sure to let us know how much of a pain it was.