For the most part that's true, below about #12 most balls use a generic core. There are a few that have a high tech core, but you have to research a lot to see which ones do.
IMO once you get that light in a ball, it doesn't make enough difference to worry about.
Also the Berserk the 13-12 has a different core and thinner shell than the 14-16 balls do.
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