Great questions! I had to do some digging around for these since I was noticing the same things you were. After speaking with Ray-Ban
to get some more clarification - it turns out the difference are pretty small. The 001-14, for example, is different from the W3280 and the L0205 because it is offered in different sizes, 55mm or 58mm lenses. The lenses are also a lighter green compared to the other two models.
The W3280 and the L0205 are different because they are offered in two sizes. The W3280 is available in only 58mm lenses and the L0205 is available in only 62m lenses.
We hope this helps you out.