Just for grins, I asked the google AI about the difference between the Mark I and Mark II versions of the Model 28. The response looked pretty good, mostly relying on the (ahem) outstanding resource here
But the AI response also relied on this-
As a Mark II, this model benefits from updates over the Mark I, including improved interior ergonomics and subtle styling enhancements…
(From a web page on the Jensen Interceptor sports car. )