There are no such things as "stupid" questions. However if you think your question is a bit stupid, then this is the right place for you to post it. Please stick to easy to-the-point questions that you feel people can answer fast. For long and complicated questions prefer the other forums within the support section. Before you post please read how to get help
If you have installed all available upgrades from the Update Manager, then none. Both releases use the same repositories, so the Update Manager will "pull up" the versions of software from the RC to those of the final release.