can the 737NG/737MAX fly over the atlantic eg CDG to BOS?

Yes however the planes must get ETOPS 120 or 180 certifications to fly the most favorable (shortest route)
Westbound might require refuel stop depending on headwinds.
There was a 737 flight from Houston Texas to Norway which was 5000 miles

Yes. BUT in the 70s you had to fly transatlantic with a plane that had a minimum of 3 engines.

With progress in the future maybe they may do it with no engines haha