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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"None are so blind as those who will not see."
Unofficial Ballreviews.com FAQ

Not the same ball. Like said before the THS is hiding the difference. You are either watching your SA bounce off the wall or the Cell holding. I'm betting on the Cell holding since in most parts of the country you can not usually throw the Cell on a THS. The Cell also absorbs oil much slower. The number 40% less is sticking in my head but I may be wrong.
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Always be sincere, even when you don't mean it

Known Cell pimp