That’s a pretty big change in the claims between the two popes. One claimed total power in both the spiritual and temporal...the other backed off the temporal and modified the spiritual.
I am sorry you don’t understand. You pastors have not educated you in Scripture or the Doctrine of Christ and have left you to figure out everything with your own limited judgement. I suggest you read this:
https://www.amazon.com/Catechism-Council-Trent/dp/089555884X