The only nozzles I’ve seen separate on gas pumps at most gas stations are the “non-standard” fuels like non-ethanol, E15, E85, and the pumps that offer diesel. The rest is all one nozzle, whether the station offers 3 octane levels or 4.
There is the odd station out there that has a nozzle for each fuel type but it isn’t common, at least not around the areas of the country I’ve been.
The first time I ran across a pump that offered E15, it took a bit for it to process but I figured it out. I had the 2019 at the time, so it wouldn’t have been a big deal but I’d rather burn as little ethanol as I can.
I’m not a big fan of burning food as fuel.