No guarantees, but the nadir should be in the same general time frame. It can move, but not necessarily due to just a change in dose. Sometimes it just happens earlier or later. It can also be affected by the feeding schedule if it changes in terms of when they eat, and how much they eat during a cycle.
Prozinc is supposed to reach nadir between +5 and +7, and last for 10-14 hours. That's a close as their website will narrow things down.