Why does gitlab icon change shade

Question

I have noticed that gitlab has a different shade of icon and I can't figure out what makes the icon change.

The one on the left is the more common logo.

The one on the right is the shade I noticed start to appear several months ago.

What does the lighter shade icon represent?

Answer 1

I believe it has something to do with their new interface.

It's odd -- contrary to what @sytech posted, I've noticed that I sometimes have multiple tabs open to the same GitLab page (e.g. an open MR) and one of them has the orange icon and the other has the yellow one. For example, right now:

Flipping between the two tabs, I see that the one with the yellow icon has the word "next" inserted next to the gitlab logo up at the top-left, whereas the other one doesn't:

Clicking on it lands me on a page where I can flip a toggle to use their new interface. Clicking the toggle instantly changes the favicon: