Two Teslas, 1 on ChargeHQ vs 1 on 'Charge on Solar'

I have Solar, Powerwall 3, Two Wall Connectors Gen 3, a Model Y and a Model 3. I am testing having the Model Y being managed by ChargeHQ, and the Model 3 being managed by ‘Charge on Solar’. How will they decide priority of charging? Can I dictate that from the ChargeHQ App? Thank you