Thats very interesting!
Yes, it is. Having been around the game for decades, I've heard all the urban legends about cue balls. The measle ball is bigger heavier, rougher, smoother, etc. The red circle is smaller, lighter, smoother, has a different finish, etc. Also, the older blue dot and red dot were lighter, smaller, etc.
There are two tools you need to set most theories aside. A micrometer, and a scale. Usually you will find there aren't differences major enough to have an effect on play, and more than likely, your mind has been trying to convince you of differences because you're heard them. It's human nature.
All the best,
WW