There would be difference like interpreting the parables of the First and Second Reading, and the Gospel during Mass, but the message of the Gospel remains the same.
However, any Church document like Papal Encyclicals, Vatican II Documents, and other Magisterium document about a doctrine, or dogma is same. The Seven Sacrament are affirmed by the Holy See in the Vatican, as well as basic beliefs and practices.
A Catholic layman may disagree with contraception, but the Church Authority is always against it. Doctrine and dogma are unchanging but discipline within certain practices of the Church can change. If the Vatican wants to allow married men in the Latin Rite to become priest, it can happen.
The Church itself cannot change doctrines and dogmas. Women priesthood would never be acceptable because Jesus did not establish women priests. Nor will the Church allow gay marriages because the Church forbids it and does not recognized it.
I think I answered that remark from the post above.
Scripture is pretty clear that infant baptism was a common practice during the Apostolic age. The Holy Spirit guides authoritive Holy men to the Truth.
Jesus made it pretty clear in the Scripture that he would be with them and they would not error in terms of moral and faith.
John 14:16 - Jesus promises that the Holy Spirit would be with the Church forever. The Spirit prevents the teaching of error on faith and morals. It is guaranteed because the guarantee comes from God Himself who cannot lie.
John 14:26 - Jesus promises that the Holy Spirit would teach the Church (the apostles and successors) all things regarding the faith. This means that the Church can teach us the right moral positions on such things as in vitro fertilization, cloning and other issues that are not addressed in the Bible. After all, these issues of morality are necessary for our salvation, and God would not leave such important issues to be decided by us sinners without His divine assistance.
John 16:12 - Jesus had many things to say but the apostles couldn’t bear them at that point. This demonstrates that the Church’s infallible doctrine develops over time. All public Revelation was completed with the death of the last apostle, but the doctrine of God’s Revelation develops as our minds and hearts are able to welcome and understand it. God teaches His children only as much as they can bear, for their own good.
John 16:13 - Jesus promises that the Spirit will “guide” the Church into all truth. Our knowledge of the truth develops as the Spirit guides the Church, and this happens over time.