Plesk and Mult-DB database creation questions

I was wondering if I used the Plesk control panel 'Add New Database' tool to create the 4096 databases needed for our blogging community project will using this tool equivalent to executing the following line from the PhpMyAdmin - SQL tab:

CREATE DATABASE comdb001db_000 DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;


Reason I am asking is that through this tool I can't select the Default Character set or anything else, I am just allowed to enter the database and that is it...

Also I was wondering will it make any difference if I assigned the same username and password to all the 4096 databases or is it a must that I create a new username / password for each one of the 4096 databases?

Thanks in advance for your time and efforts