Qestion BatGirl vs BruceWayne

Please, I bought two Clean Factory watches for Lili.

But there is a slight difference.

Bruce Wayne has a thicker crystal; you can see it in the photos.

So how is it possible that Clean models have a different crystal?

Another thing: a ring on Batgirl. Have a slightly loose moment, and one on Bruce Wayne is really steady. I provide photos and videos.

Any comment is really appreciated..