I found some rings that add bonus physical damage. Once has +x-y Damage and the other has +x Minumum Damage +y Maximum Damage.
Here is a picture:
Both are from post 1.0.3 and there is still y +x-y Damage attribute contradicting this question.
So my question is how do they differ and would they have the same effect if the value for x and y were the same for both rings (all other attributes ignored). So if the first had +10-12 Damage and the second had +10 Minimum Damage +12 Maximum Damage would they be equal?