It means they use the same generic core for all of their 12 lb. balls regardless of what kind of ball it is. From their website:
"At Brunswick, the unique core shape of each individual ball is used for weights from 14 to 16 pounds. This approach to lightweight ball engineering provides bowlers with consistent ball reaction characteristics across this weight range. At 12 and 13 pounds, Brunswick uses a generic core shape with a RG-differential that is close enough to the 14 to 16 pound shape so the same drilling instructions can be used."
So if you chose the ball based on the core design, it doesnt apply here.
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