I would like to install into same database more installations of this script.

Is it possible?

There's no easy way to make multiple installations in the same database, it is possible but it would need to be done manually.

First you would need to install the script once, use whichever tool you use to manage your database, for example phpmyadmin, rename all the tables from 'news30_story' to 'news30_2_story'. Then edit the config.php and rename the tables there also.

Once you've done this you can then install the script again in the same database, and continue to do so by repeating the above.