Basic Magnum Engine question

Ok so I got off the phone with sealed power and got the info...this is good info for anyone to have that's rebuilding a magnum and going .020 over.

The Sealed Power piston, part number WH65550MM weighs 620 grams with the wrist pin. Subtract the factory wrist pin weight of 154.6 grams and you get 465.4 grams, or a difference of 4.6 grams lighter for the new piston when compared to the factory 470 gram slug. That should be within tolerance for not needing to rebalance, correct?