In brief
Shared hardware does not necessarily mean a common software environment.
Useful to know
The Bosch Cockpit integration platform brings together computing tasks for instrumentation, multimedia and other functions in one powerful block. A hypervisor is described for separate software environments. [1]
This helps to understand why two displays do not necessarily mean two independent computers. At the same time, common hardware does not prove that all applications work without separation. When comparing a car interface, watch the behavior of the functions, not just the number of screens. The architectural capability of the platform and the actual configuration of a model are different levels of description.
Sources
For further detail and to check the information: