Regulations are a bit different, not just on what counts as rest, but on physical format.

The normal US front-engine is rare in Europe.

The US extended sleeper generally doesn't exist in Europe

The European compact cabover generally doesn't exist in the US.

The scale influences this more than a little bit. The longest drives you'd find it sensible to make hauling freight inside Europe are between 12 and 18 hours of nonstop travel, while in the US they're more like 40-60 hours.