How about if you drilled multiple 1-inch holes at 4 inches deep in a 6-inch circular area, and then plugged all of them? Every hole you drilled and then plugged would be filled back in with a different weight and density of material.
Ergo, you end up with a ball that would still be under the maximum overall weight limit of 16 pounds, and would have a USBC star stamp and serial number imprinted upon it, but it would be materially different than a brand-new ball in the same line. I don't think the RG and diff would be the same as the published numbers, particularly not if you clustered your plugged weight holes specifically in a tight formation so as to drill out dense core material on purpose, then fill them back in with plug.
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