Entity Access is different for different Scenarios

Summary

Entity Access is different for different Scenarios

Content

Does anyone know if there is a way to have a user/group with entity access that is different for different scenarios?  It's a little confusing, but I have some users whose access is different between budget and forecast scenarios.  For example, John needs to have write access to three entities (123, 456, and 789) for the Budget Scenario only.  In the Forecast scenario, he only needs to have write access to 123.  Currently, he's in a budget group that provides write access (during the budget process) to only the budget scenario and to the three entities.  He's in a separate forecast group that provides write