Barry,
Don't fall into the same trap. Appearances can be soooo deceiving.
The color, the surface finish, and the general appearance do not begin to imply the that balls have the same coverstock formula. Almost any cover can be made to appear similar in overall apparance by the right color and surface.
In fact, I believe that most manufacturers, if they decide to use the same coverstock formula, will go out of their way to make sure not only are they different colors but also different finishes. Both the SR solid and the Cell solid are both finished at 2000 grit Abralon.
In general, if they look alike, the odds are nowhere even close that they are even near to being similar.
If one is pink and the other is black and blue, the odds are better that they are similar.
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"None are so blind as those who will not see."