Although I do have a small repertoire of pieces, I can comment mainly about improvisation, and there the listening mind is certainly a very peculiar thing; even the musical merit of the same recordings and sections of recordings can markedly differ from day to day.
I read an interview with Ravi Shankar, the sitar player.He was asked if he was improvising, or playing a set piece. He replied that it was a standard piece that he played the same way every time.then they showed him in a recording that he was playing different notes. He said yes of course, but those differences aren't significant.