CatBus said:
What I'd like to know is if there is any way, other than manually comparing a couple hundred thousand still images against each other, to do this frame comparison for any two given releases?
Diffing the begin-shot-change numbers is one (pretty good; not perfect) way to tell if two sources are in sync. (Empty diff => all shots in both sources begin at the same frame number.)
If the two sources are sufficiently similar, then it's a 99% guarantee.
I can give further instructions if you're interested.