The Ranch has flat ejection so as not to hit the scope with the brass, also. The standard Mini ejected more up and about half your brass would bounce off a scope mount. This usually never bothered it, but does put dings in it (and your brass).
The Ranch didn't just COME with rings, it had a different shape to the top of the cast receiver to accept those rings, also.
Because it was redesigned for better scope use, it also has a flip-down rear sight. The standard Mini does not.
For many years, both models were in the catalog (in blued and stainless) and easily available, with the Ranch costing more.
All Mini-Thirties are the Ranch design.