It is possible with ezpm.php (in the root of your eZ installation), but there are some unresolved bugs related to ezpm:
- call to undefined function export: http://ez.no/bugs/view/8718 - Error: (eZFileHandler::copy) Unable to open source file in read mode: http://ez.no/bugs/view/8821
But I think importing will work fine.
For more info on how to use ezpm, read: http://ez.no/products/ez_publish/documentation/ez_publish_3_4/content_object_export_with_ezpm