WD80EFAX - label

What’s the difference between WD80EFAX? Only label?? Maybe one of them is never more reliable?

Please edit out the s/n from the first photo.

WD seriously what happened with you?
You offer new disk models (from what I can see without HelioSeal technology) under the names of older, proven and propably better series. The alphabet is big enough that you could easily find a few other letters to mark them differently. I see another ugly practice on your side.
The more I read, the more dirty practices comes out.