Was Quantum Leap shot on film or video? If it's from film, and the audio has been sped up to go from 24fps to PAL's 25fps, then it's a simple case to slow it down to match NTSC's 23.976fps (for telecined film with 3:2 pulldown).
There's a variety of programs that can do this: VirtualDub and AviSynth in the video world (Premier Pro can probably do this too), or an audio editor like Sound Forge or Audacity. There's also a simple little command line program called SoundTouch that I've used before.
On the other hand, if it's video, then it depends how the conversion was carried out. It may be the case that audio durations match anyway.