as i say, just for the heck of it, here is my match-frame method
you have your original correct edit on one timeline,
and your synced layers, back from plural eyes in an adjacent one.
you park on your first clip in the edit timeline
f to match frame
Q to toggle to the canvas
Shift Command [ to tab across to the other timeline
f to do a reverse match-frame to find that frame in the timeline
(there might have to be “home” key before f, as sometimes match-frame will only look forward and not backward)
now, the track with the new clips needs to be your auto-select track
and we do a similar dance:
f to match frame
Q to toggle to the canvas
Shift Command ] to tab across to the first timeline
F11 to do a replace edit back into the other timeline
jump to the next clip, and repeat.
these are the crazy things i get up to on a Saturday night ☺ (here in Australia).
although, i reckon it’s not too long before we have a visual equivalent to PLuraleyes that will make his sort of thing a piece of cake.
cheers,
nick