Hi Rahul!

Cardiac Surgeons operates heart, lungs and other chest organs. They perform surgery, diagnose and treat diseases of the above organs.

Cardiothoracic Surgeons perform procedures through incisions which will make them divide the breastbone and working in between the ribs.

So, on the whole, yes Cardiac Surgeon, Cardiothoracic Surgeon, Cardiovascular Surgeons and Thoracic Surgeons all are the same!