NOT the same ball, near as I can tell.
RG on the SA is much lower.
SA has no mass bias.
Coverstock is not the same, as far as I can tell.
Remember that house blended oil patterns hide the difference between balls very well. Try using both on sport patterns or PBA patterns or try using them in different houses, on different oil patterns and different lane surfaces. This should show the difference.
Unless your release already does such "magic", the Cell seems to allow both target and release forgiveness much more so than other balls, PLUS it is designed with a different coverstock that absorbs oil at much slower rate than average.
FYI I believe that, although Storm owns Roto-Grip, Roto-Grip sources their resin from a different supplier than Storm uses. At least that used to be true.
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