No. In addition to slight difference between models and /manufacturers, there are generally 3 type of cue balls. The normal regulation play ball that is not intended for use on a coin operated table is most common and is what should be used to learn and practice cue ball control. Cue balls made for use in coin operated machines need a way to be released so they are not captured like the numbered balls - so, these cue balls are either larger (no longer common) or have a metallic center (slightly heavier than a standard cue ball).
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If you take 4 balls and there are only 3 colors, there is no way you cannot get 2 of the same color. So 100%
American footballs and Rugby balls are both considered 'balls' but neither are spheres.
Basketballs, Baseballs, Golf balls, some bouncy balls, a Globe, and things that carry that same shape. :)
Depending on the sport, balls could be made of : Plastic, rubber, composite or all natural materials.
They equal the same