Hey Cindy! This is Michael on the Moz Help Team! You can absolutely set up a second idential campaign with different competitors for prupose of tracking 6. This is actually the recommend workaround for our campaign limitation of tracking 3 competitors. Keep in mind that the 2 campaigns will most likely not update at the same exact time, but if you remember the day of the week that you setup the origianl campaign, you'll want setup the second campaign on the same day to keep their data gathering in sync.
I hope this helps! If you need more details guidance on moving forward with this option in your account, feel free to reach out to us at help@moz.com. Our Q&A forum is a great place to get some quality answers to your queries, but help tickets can help ensure the privacy of your account details.
Cheers!