I installed Iridium to see what it's like. It calls itself Chrome so what is it? It doesn't have my bookmarks or adblockers as I haven't imported them yet.
A while back I changed my 24hr avatar, or tried to. The old one keeps coming back. Right now I have Chrome, Iridium, Edge,and Brave open. Chrome and Iridium have the new avatar, Brave and Edge have the old one, all from the same profile.
Several browsers out there use the Chromium code base. They each have unique tweaks to the build to make in more secure or lower overhead.