Producers of commodities, tend to export the best stuff, and sell the crap internally... It has an interesting result: the flavour (or quality, for non-edible products) of some stuff, is drastically different, for example two famous cases is chicken, and oranges, it happened once to each industry to be unable to export for some reason, and they dumped the export product in the internal market, people that bought the "export" chicken and oranges were very impressed, it tasted MUCH, MUCH better, also the export oranges are obviously different (they are bigger, heavier and have a more striking colour).
Unfortunately, I am not one of those people :( (I had girlfriends that tasted those, but when it happened I lived in a city that was too small to get those products).
Still, for many people that think that produce can not be THAT different, I can say, yes, it can, even when made by the same company, sometimes in the same farm.