Try Ctrl-D (metadata download for selected books): Then use the Review button. THIS does 1 book of the list at a time
It shows New on the Left, Old on the Right and the < (make the new, the old value for each field. Except Tags has a small down arrow that allow a Merge)
If the left is blank, the right will Auto-Copy upon accept
The Left side also supports the standard lookup (existing DB values)
What it does NOT do is offer a Block/don't copy if the left is blank and you have bad/wrong data in the Right (existing values)
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