Upgrade from 2.3.3 to 2.6.2

Is there any issues upgrading fra version 2.3.3 to 2.6.2.
Any thing I should be aware of?

When I upgraded from a 2.5.1 version to 2.6.2, there was no problems at all – just took db backup, copied all files – then overwrited the files with the 2.6.2 installation (referred to the old db) and went to /wp-admin/ of my website.

Is it the same way when upgrading from 2.3.3 to 2.6.2?

BR.
Dan Hansen