What are the differences if any between cardiac catheterization and coronary angiography?

No: A common coronary catheterization is an invasive procedure that requires insertion of catheters inside the arteries and injection of "dye" to highligth the arteries of the heart. A ct coronary angiography is new method to take a look at the coronary arteries without insertion of catheters. Please note that there different indication, and in some cases the invasive procedure is needed.

Tubes +/- Dye to see: blood in blood vessels. Cath=tubes inserted into blood vessels; used to measure pressures &/or inject agents into blood, via the tube. Angio(blood)graph(picture)y is injection of contrast agents into blood, during catheterization, so as to image, typically using X-Ray (a few seconds) or NMRI (few minutes) blood flow within blood vessels. Problem: does not show plaque; only narrowings due to clots.