On this issue, I'm somewhat ignorant of the details of many tv shows that I watched in the past. I was never really a diligent tv viewer that paid attention to a lot of details in every episode. Frankly for most episodes I watched, I completely forgot about the details after a few weeks. With the passage of years/decades, I only really remembered general outlines and maybe some overall arcs. So I wouldn't really know if some scenes are missing and/or if the music was slightly different.