Bullocks. The original films never mentioned "Chosen One" or "Balance of the Force"
No way! Concepts that didn't firmly exist yet or weren't fully formed in Lucas' mind weren't mentioned in the Original Trilogy? Nothing gets by you.
I guess we'll just have to settle for Obi-Wan saying "That boy was our only hope" and Yoda replying "No, there is another" which comes pretty close to being Chosen One-y sounding between Luke and if he fails, Leia.
You understand how a prequel works, right? That it can change the way you interpret the original. So the Chosen One mentioned in the Prequels can either be Anakin or it can be Luke, depending on your point of view, to paraphrase Obi-Wan. Obi-Wan in
Rebels certainly thought Luke was the true
Chosen One. Luke and Anakin brought the final destruction of the Sith (well, depending on how fleshy Palapatine is in
The Rise of Skywalker) which the Chosen One was prophesized to do.
All of which is besides the point I was making that you glossed over, as you so frequently do in your single-minded pursuit of always being wrong, which was that the difference between the prequels and OT and the sequels was the transition from heroes that come from dynasties of Force users and galactic power brokers (Luke grew up as a farmboy in the sticks but by the next movie we find out he's a legacy Force user, the son of the previously thought of Chosen One). Leia comes from both a powerful family of Force users and wealth and political power in both her biological and adopted families. Lando started from the bottom now he's here (administering Cloud City). Han's the only one who came from nothing and pretty much stayed that way until he married up.
In the sequel trilogy you have Rey the abandoned scavenger, Finn the stormtrooper janitor defector, Poe the fighter jockey with (as revealed in the new movie) a
criminal past of his own. Rose is a mechanic. Then you have the street urchin kids on Canto Bight who symbolize the next generation of Jedi and to a lesser extent Rebels/Resistance. Kylo breaks the mold but he's also an evil dick who you're not supposed to look up to.
So, the OT to a lesser extent and PT especially place a greater emphasis (though not total) on Chosen Ones or Jedi dynasties or political dynasties or the rich and powerful while the sequel trilogy places more emphasis on the next generation of heroes can come from your Average Joe or Jane blue collar worker or soldier or reformed criminal.