Since the pin is in basically the same position the flare potential is the same so the should have the same amount of hook but the shape will be different. If the stacked one has a high degree of positive side weight it may actually end up with a bit more length, since the more pos side, top, and finger weight you have the more length.
Symmetrical balls are not affected nearly as much as asymmetric balls are by the MB placement.
Swinging the CG out toward the PAP causes the ball to loose axis tilt and rotation faster so the stacked ball may just be loosing it's AT and AR to quickly to have a big reaction when it reaches the break point.
Have him roll both balls with a higher degree of axis rotation than normal and see how they react.
I am curious though why would you drill both balls with the pin in the leverage position?
The reason I ask is I have 2 of the same ball:
4.5" pin drilled 5.75(P) X 4(MB) pin high above middle finger, great from outside the 7 if firm or SKID/SNAP from inside when the heads or track area are going away.
3" pin drilled 3.75(P) X 4(MB) pin just above ring, great when I need the ball to read a little sooner, when the backends are screaming, if the outside is over/under and the track area is spotty and when playing a tighter line.
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