WRONG. Papal bulls are NOT EX CATHEDRA statements. If you even bothered to read the Catechism, you will see that an ex cathedra statement is explicitly stated as such and must be a statement on doctrine and morals. The bulls on the inquisitions, were not ex cathedra nor doctrinal or moral in nature.
Not every word is a term. Not every term is a definition. They're the same thing! ;b
Though not officially! It is not issued by a bishop, it is not issued by a priest or any other presbyter in the Roman church. It is issued by the pontiff. It's the same!