The ending with Jake getting killed/impalement was in all US Theatrical Versions, but in the European versions, it was the one that is seen on the DVD.
The 'Shark exploding' ending was added for the overseas because of the test audiences didn't approve of Jake's death, but that was not the case for the American version.
All DVD/VHS/Beta/Laserdisc releases are using the European 35mm print.
-JawsTDS