Reads your screen recording.
Names the difference.
Scroll, pause, scroll, pause.
About one screenful at a time. A paused frame reads almost perfectly; a fast fling smears the text past recognition.
Pause for a beat after switching tabs.
Rows from the old list keep sliding off-screen during the animation, and they must not be counted against the new one.
Start at the top of each list, reach the bottom.
A recording that begins mid-list has no way to know what it missed.
Capture followers and following in one recording.
Both lists are needed to compare them.
A longer file is fine. Nothing uploads, so length costs you nothing but patience.