I believe once your IN the boarding area of the airport you never leave outside the secure area to catch another flight. You don't go back through TSA.

Most airports group airlines together in a wing so if you're not changing airlines you should be staying on the same concourse.

We haven't used Charlotte in a couple of years but the last time we flew USAir from Prov RI and changed planes in Charlotte we only went 3 gate numbers to the next plane. They usually announce the connecting flights by city and give gate numbers while you're landing. If you don't hear yours don't hesitate to ask flight attendant. That way you don't have to search for a monitor to check gate number of the next flight.

Have a great time.