Yes, you may submit different papers. However, you should not submit more than three papers.
You may not submit the same or slightly varied papers to different tracks. If you do so, this will be considered as unethical scientific behavior and both papers will be rejected.
One of our goals is to have a diversity of people on stage presenting papers. If you have multiple papers accepted, we encourage you to coordinate with your co-authors so that each of you presents a paper, rather than having one individual present many different papers.