I higjly doubt the last part, but I don't have any numbers. Just as some added cintaxt, the actual ciats are also quite different between European countries. And treatment is not the only cost driver, the way the system is set-up also has a big impact. One of the reasons why Germany is also constantly among the most expensive countries.
But the costs are different across the US as well. Of course it costs a lot in San Francisco, just like it would cost a lot in a major EU city - and it costs less in a rural area.