In terms of quality, there's not that much difference - they're both noisy analogue sources, however the brightness, colour saturation and screen centring are completely different between the two clips.
So what should I do?
- Spend time trying to get the picture from another source to match as close as possible that from the PAL laserdisc (but it'll never be a perfect match)
- Leave the audio as it is and just insert a few black frames into the laserdisc capture where this wipe is missing
- Skip those frames completely, and have a jump in the audio at that point