Moonwald, to help you in a proper way we need to know the ultimate goal. May be there is another way to solve your issue.
Concerning the tables that you need to migrate to another database, first of all you will need to make a language key export. Go to the Admin Area > Settings > Language > Available Languages > Click Export > Choose the Base section for language you need. After this add ziped file as a new language pack on another site. In this case the old values will not erase but new values will be added. You need this because the ow_base_question_value table is associated with language section.
Then you will need to copy the following tables:
ow_base_question_value
ow_base_question