actualy yes there is, they have a base minimum and maximum damage. unless they changed it over night which they have not. go look at the orange lightsabers on balmora then go look at a lvl 50 orange light saber, diffrent base damage.
There are some orange items that sold with mods , enhancements, etc whatever on them. That's the source of the base min and max damage you're talking about. Orange items on their own do not have stats.