The regulations only apply to the engine computer (which is probably not changed much in each model year).
There is no strict quality or safety (or aesthetic, for that matter) regulation for the entertainment/climate control system user interfaces.
(In case you've ever wondered: yes, these screens do often show information from the engine computer. For example, the 2nd generation Prius's center console screen shows live information about the hybrid system. But that information is pretty much always obtained from a read-only connection to the CAN bus.)
There is no strict quality or safety (or aesthetic, for that matter) regulation for the entertainment/climate control system user interfaces.
(In case you've ever wondered: yes, these screens do often show information from the engine computer. For example, the 2nd generation Prius's center console screen shows live information about the hybrid system. But that information is pretty much always obtained from a read-only connection to the CAN bus.)