The way they commercially raise the chickens to have high Omeg-3 eggs is completely different.
They are fed 'seafood products' and Fish Oil & sea vegetables...They will even go so far as to add Fish Meal to the grit.
And unless it says specifically "Free-Range" and/or you trust the producer - chances are they still fed Chicken By-Product Meal, at least indirectly, as it is used as a 'filler' in many commercial feeds.