I have both and they are drilled completely different, so a much larger gap between the two. I have a rico layout on my Forza and a motion hole layout on the Shock. The Forza is really smooth and controlled unless I get it to the dry too soon. Then it really takes off. The Shock is still earlier than other balls that I have, but it gets more length than intended with great recovery down lane. It reacts more like the Octane than the Forza. The Forza definitely handles the oil better.
Drilling them the same, I would expect that the Forza is still a little earlier and smoother. Maybe not enough difference on a house shot. How mine are drilled, they are definitely different.