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The park pass is not a decal which is permanently fixed to a vehicle, rather it is a printed card which is designed to hang from the inside mirror of a vehicle. This can be removed from your first rental vehicle and placed in your second rental vehicle. These passes can be purchased at the gate when entering the park as well as at automated vending machines that are located at various points in the park. It would be very uncommon to have this pass included as part of a car rental (even for rental agencies inside the park).
The rules are that this pass needs to remain in your vehicle in a visible place. This is because the most common form of enforcement of the park pass requirement is to have by-law officers visit the parking lots of attractions and write tickets for all the vehicles that donβt have a pass.
The system was designed with the assumption that people would be with the vehicle that they entered the park with for the duration of their stay in the park. My understanding of the fee rules are that you are required to pay the park fee for days you are in the park without a rental vehicle but in practice there arenβt any mechanisms to enforce this other than the honor system.
As an aside, not all vehicles in the park require a park pass since one is permitted to drive through the park non-stop on certain highways. Unfortunately, driving through the park non-stop to a car rental return depot inside the park likely doesnβt qualify.