UXP how to analyze current frame

Hi.. I have two video clips that are overlapping a you can see.  Due to the way the footage is output, the last few frames of the first clip are duplicated in the first few frames of the clip.

Each export/download of video, the number of overlapping frames is different, thus, presently it's a very manual process to align them, and a bit tedious.

I found if I set the top clip to Difference Blend Mode, I can nudge it to the left one frame at a time until the screen goes completely black.

I'm wondering if using UXP if I can automate this process... basically nudge one frame at a time, and analyze all the pixels to see if they're all black.

First question I have is, is there a method to analyize the current frame output in this way?  if so, please advise how...