

Nope, there were two different versions! The 6 switch is the original. (And in my opinion the better looking one!) The 4 switch came later, and still has 6 switches, they just moved the difficulty switches to the back. I believe it saved them some money and made production a little easier because everything was on one circuit board with that setup.
Ubuntu was my first when I started poking around with it. Not sure which version, but it was during the Unity era. Pop!_OS was the one I started using when I switched full time. I’m still using it on my main computer, but I’m also using Fedora, Ubuntu, NixOS, and Mint on other devices because I like variety!