Is database structure the same between 3.4.3 and 3.5?
 
Is it possible to do a database restore for version 3.5 using the backup database from version 3.4.3?
 
Thanks.

3.5 has multisite capabillity.
You can do a restore but then see
http://www.viart.com/db_error_1054.html
to enable the DB upgrade to 3.5