Is the europlug actually mandated or just common? I've seen a few different, sometimes incompatible, sockets in different mainland europe countries. If I was i

Is the europlug actually mandated or just common? I've seen a few different, sometimes incompatible, sockets in different mainland europe countries. If I was in NA, I would want to use british plugs on my 240V stuff if it was legal though. And not just because I hate the soles of my feet.