There is still, in the modern production, a variety of dials.
Look, for example, at AP with the RO and ROO, JLC with some watches such as the Amvox II, Panerai with the Luminor, Rolex with the Daytona, and so on...
The Geomatic received different dials, it is true, and the Geophysic, basically, received 3 dials: The E 168, the Deluxe, and the " Cross Dial ".
The phenomenon is maybe less current, nowadays.
Production rationalization?
Best,
Nicolas.