Dials were very close, even if some had their own " personality ", as, for example, the Sub " Snowflake " 7016 or 94010 / 94110.
The biggest difference? The movements, which were outsourced, which is not the case, of course, ,with Rolex watches ( with a few exceptions, such as the Daytona, housing a Valjoux ).
Yes, Tudor is a kind of " Sister brand " for Rolex.
And yes, several of them were used by Armies: Argentina, South Africa, US, France...
Best,
Nicolas