Probably just different words for the same thing but take both your captures and put them on the timeline on different layers.

Select each in turn, right click and choose the 'unlink audio' option (or however it's actually phrased.

Once done you can then just delete the video layer of the clip you don't want, leaving just the good audio and then delete the bad audio layer.

You'll need to sync them of course but you'll end up wiht just the good audio and the good video on your timeline.

__________________
I'm not young enough to know everything!