A script comes back from review with no track changes and no note about what moved. Paste the two versions side by side and see every word that was added, removed or left alone. It compares by word rather than by line, so a single edit in a long paragraph shows as a single edit.
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Paste two versions of the same text and see every word that changed. Additions are marked in green, removals in red, and the words that survived are left plain. It counts each so you can tell at a glance whether this was a light edit or a rewrite.
A character-level comparison highlights fragments in the middle of words and is unreadable on prose. A line-level comparison flags an entire paragraph because one adjective changed. Words are the unit a person reviewing a script actually thinks in, which makes the result something you can read rather than decode.
A script comes back from review with no track changes. A vendor returns a translated file and swears only two lines moved. You are comparing the narration in version four against version three because something in the audio no longer matches the captions.
If the words are identical and the two still differ, the change is in whitespace or in a character you cannot see. This says so explicitly rather than showing you an empty diff and letting you conclude nothing happened.