In my experience, there are at least two different Diesel nozzle sizes in the US, and both are different from gasoline nozzles.

https://exchange.aaa.com/automotive/car-care-repair-and-main...

US Diesel cars before about 2013? didn't really care aboit nozzle size. Some diesel pumps had the old standard nozzle size; some had the new, smaller, nozzle size intended for unleaded gasoline. VW started putting in anti-misfueling devices into their cars (via recall for mine), and then you could find which stations had unleaded sized nozzles because it was hard to use those. Presumably, nearly all of those have been replaced with the old standard size.

But then truck stops have giant nozzles for the giant tanks on semi trucks. Those won't fit in a regular car.

I didn't know that about diesel. Regardless, I was hoping we could find some agreement globally .