How can I politely put this --- yes and no.

Some RG covers are equivalent to Storm's; some are very different. AS far as I know, they use the same chemical supplier, but the Sonic series has covers unique to RG. That's all I can say, at this point in time. Ask RG for mote intimate details.

Oh, the APocalypse, again, as far as I know, has a cover also unique to RG.

They DO design their own balls, not just cores, not just covers - they design the whole ball. Try one of them; you may like what you get.

This may not be entirely related...but...I've averaged one or two new balls a year for the past 8 years.  And each of the purchases has been a Storm.  I fell in love with the company after getting my Original ThunderStorm.  Now I've decided to try a RotoGrip - Sonic Boom....I've heard some people question the longevity of the RotoGrip coverstocks.  I clean on polish my balls on my spinner every 3 sets or so.  Does anyone have an opinion on how well I should expect the cover stock of the Boom to hold up??  Thanks in advance.

Lee Tolman