We follow the official listing: https://www.cbs.com/shows/big_bang_theory/

But "The Change Constant" and "The Stockholm Syndrome" have different production codes. And they are aired separately in other countries. And having a special "Unraveling the Mystery: A Big Bang Farewell" as 24th episode here (and returned by API) confuses my tv shows scraper because it's "The Stockholm Syndrome" videofile actually. Also there is a separate "Unraveling the Mystery: A Big Bang Farewell" in specials here - https://www.themoviedb.org/tv/1418-the-big-bang-theory/season/0/episode/4

P.S.: I've already started editing the 23rd episode (as "The Change Constant" ONLY) before I found this discussion, so what should I do next? Revert my changes? And rename my video, e.g. to "12x23 - The Change Constant - The Stockholm Syndrome. Part 1" and "12x23 - The Change Constant - The Stockholm Syndrome. Part 2"?

­­> But "The Change Constant" and "The Stockholm Syndrome" have different production codes. And they are aired separately in other countries.

It doesn't matter. It originally aired as one episode on CBS. It's all explained in the Contribution Bible: https://www.themoviedb.org/bible/tv/59f743289251416e71000037

Also there is a separate "Unraveling the Mystery: A Big Bang Farewell" in specials here - https://www.themoviedb.org/tv/1418-the-big-bang-theory/season/0/episode/4

Thanks, I removed it. FYI it's a perfect case for alternative order with the farewell in the specials.

P.S.: I've already started editing the 23rd episode (as "The Change Constant" ONLY) before I found this discussion, so what should I do next? Revert my changes?

Yes, please!