Quality wise, there is not really any difference, the difference is in the application and set up of the product.
Ecoat-epoxy, waterborne base at most plants now and then the clear, the clear will be same as a jobber sells of that brand but they do a few things different.
First, robots don't get into mixing paint, so they will use a "blocked ISO" in the clear, in other words the clear will only harden once it reaches a certain temp in baking, most are set for 400-450 at 60 minutes to cure out and can be as high as 500.
The other thing they do is vary mixtures of UV additive, where a normal clear may have 2, they will use a mixture of three or four, so the clear can be applied thinner and not need the "2 mil" net rule (in theory).
All t*t for tat.