Quote - I saw the change - and thought that it's good as you are able to texture both eyes in a different way if desired, for instance by rotating the iris of one eye a bit to get a natural look. I have to confess that, also I added slight differences to one iris, I did not render a closeup op both eyes so far to see if it works.

I think I didn't make myself really clear.
Being that Antonia does in fact have separate material groups for each iris, cornea, and sclera, there's no real need to have each eye part - six in all - having its own UV space. Antonia's original UV mapping has each set of eye UVs overlapping.
The benefit to doing it that way is that you can create one eye texture for each part and apply it to both eyes, OR, you can create separate textures and apply one texture to one eye and the other texture to the other eye.
So having them overlapping in no way hinders one's ability to texture each eye separately.

Now, the way I did it requires a texture artist to make separate eye textures, or at least to have to take the time to paste the textures for one side over to the other, which makes more work, with no added benefit.
The only real benefit I can see is that with having two sets of eyes on the same map, one can easily compare the one texture to the other, which really, IMO, isn't that much of a benefit being that there are many other ways of easily doing that.

I'm just trying to think ahead to the future here. if my UVs do become the "official" mapping, and Antonia becomes popular, people are going to wonder, Why in the world did he map the eyes like that?
And of course the only answer I have is that they were easy to do, and I just did it quickly, while not really putting any thought into it, which isn't a very good answer at all. ;-)