Does the from concentrate stuff have anything different other than some water removed? One you add water back in isn't it the same as the not from concentrate stuff? I.e. Still the same 4-6 oranges no matter what?
It's the same 4-6 oranges if you consider having a sterilized orange juice concentrate spend 6 months to a year in storage and lose all of it's flavor "the same" as a freshly squeezed orange.
For most commercial orange juices, all the flavor is engineered with artificial ingredients. I'm pretty sure that the only reason they still bother with oranges is legal requirements.
Anyways there is nothing wrong with orange juice from concentrate. Its always been like this: 60% OJ concentrate, rest water. As that a good healthy ration. "Not from concentrate" is a PR gimmick. Think for yourself: A glass of "not from concentrate" orange juice would have 4-6 grown oranges squeeze to fill it in. What was the last time you ate 4-6 grown oranges at one sitting, and do you really believe thats healthy? If anything it makes your liver works super hard to put all that extra vitamin C into your bladder so you can rush to tha bathroom.