What is the difference between what the Lord entrusted people with in the Age of Grace and what God entrusts people with in the Age of Kingdom?

Bible Verses for Reference:

“And that repentance and remission of sins should be preached in his name among all nations, beginning at Jerusalem” (Luk 24:47).

“Go you therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: Teaching them to observe all things whatever I have commanded you: and, see, I am with you always, even to the end of the world” (Mat 28:19-20).