H405CP versus stock magnum 5.9 pistons

The crank is what determines the balance factor. Magnum vs LA. But I don’t understand why anyone would build an engine with aftermarket parts and not at least have the balance of rotating assembly checked by a machine shop. Yes you can be out a few grams and it won’t be an issue but why spend the time and money to build an engine just to have it vibrate itself to death.