No, you may not park an Amber car at a MyWheels parking spot regardless if the Amber car is already rebranded. In February 2023, Amber cars are in the progress of being restyled to the MyWheels design.
It may occur that you will be driving a car with the MyWheels colors and logo. You can park these cars the same way as you are used to; at Amber hubs and in the service area.