Yes, they both have the R2S pearl, but the strength of the core is not even close.
Also, I didn't even consider this, but when you say overlap, I guess it depends on your arsenal too. If you have too much contrast, ie Virtual Gravity, Fast, then plastic, then yea the reaction will be pretty darn close. But as far as comparing just those two, yes, they'll be different.
--------------------
Edgar Atienza
Roto Grip Staffer
Manager of Best Bowling Pro Shops - Plaza Lanes, St. Charles, MO
edgar@bestbowlingproshops.com