Doctrinal unity, absolutely. There is a range of authority regarding Church teaching, however, ranging from "De Fide" dogma which must be believed by all Catholics through the more difficult to discern authoritatively "ordinary Magisterium" through theological consensus, speculation and opinion.
You are correct in theory but what is the actual practice?
Newsweek polls and surveys show that only 15% of Catholics believe they should always obey Church teaching, nearly as many Catholics think abortion is permissible as non-Catholics, and 75% of Catholics disagree with Church teaching forbidding divorce and contraception. Another study revealed that only 25% of Catholics now believe in the Real Presence and only 50% of the priests.
Doctrinal unity in the RCC. Actual or theoretical?