Over time : performers change their interpretations of pieces - whether due to maturity, technical degradation, or sometimes on a whim.
Sometimes for the better, sometimes for the worse, post some notable examples!
And of course Gould’s Goldbergs qualify as iconic & interesting examples too!
ahahahah diz thread zhud juz be titled
POGO 
If you listen to Horowitz’s live recordings of the Liszt Sonata from the 1940s Yale archives, the interpretation is actually quite close to his late 1970s interpretation. It’s the 1932 studio version that is more of the outlier.
There are others though. Pletnev has made a major transition in playing style, Ciccolini did too who decided to stop being boring all of a sudden in the 90s/00s somewhere. Sokolov, Cherkassky, Kissin, Kempff - maybe to a lesser degree.
Also da Arrau mofo, where me and an Arrau buddy have just concluded the end points are best.
Da 1946 unreleased
I would say that most pianists evolve over the course of their careers. A more interesting area of discussion would be pianists with the most chameleonic performances within the same recital. I can’t think of any off the top of my heads, since all the greats tend to be such strong personalities that they sound like themselves no matter what repertoire they’re playing.
Well, yeah…
As for radically different perfs, well, compare 1930’s Arrau in the Liszt concerti to his later perfs…
Richter’s first performances in the 40’s which were recorded (I’m thinking of Prok 8, Mussorgsky Pics, Rach 2) were also quite different from his later versions tru