Are you saying a doctor thought at first you had chlamydia, but it turned out it was actually balanitis? Or are you diagnosing things at home and wondering which it is? Maybe at a glance they could be confused, but the treatment isn't identical.
From another website:
"Treatment for balanitis depends on what's causing it. A doctor
might prescribe a mild steroid cream or ointment, an antifungal cream or ointment, or antibiotics."
"Chlamydia can usually be effectively treated with antibiotics: doxycycline, taken every day for a week
azithromycin – one dose of 1g, followed by 500mg once daily for 2 days."
If you're are self-diagnosing, just go to the doctor, it's simpler. If you're asking because the doctor told you he mistook what was wrong and you want to shake your head that the doc made a mistake and scared you, I'll shake my head too. But if you're asking because you're trying to check a doctor's work by looking things up on the Internet, well, amateur Internet 'doctors' don't do better than a trained MD. A live doctor diagnosing you in person is way better. (Though once the doc has diagnosed you, a lot of good information is available online if you didn't understand what he was saying.)
I hope you get over this condition soon. Good luck!