Before I get too teary-eyed, are you saying that a bunch of LEDs coming off the same assembly line are tossed into different bins and have different names?
Manufacturing semiconductors is in some ways, more like farming, than churning out nuts and bolts. There's only so much you can control in the manufacturing process, the same way that there is only so much about Nature that a farmer can control, and they can't mass produce 100% consistently identical emitters (yet).
So, the farmer ends up with, say, a whole bunch of oranges. They're all the same variety of oranges, all grown at the same time, but obviously, they are not all exactly the same. After harvesting, they need to be sorted according to their size and some sizes command a higher price than others. Similarly, LED emitters must be sorted after manufacture because they can't be made 100% identical for now (but they're getting better all the time) and some emitters will command a higher price because they are perceived to be more desirable.