Jesus and Paul were in complete harmony. Both preached the gospel and the love of God. Jesus had the sermon on the mount which taught the same message as Paul's epistles. Sin begins in the heart so a new heart and a new mind are required to be accepted by God.
Well Epoisses, if you allow me to test your saying that "Jesus and Paul were in complete harmony," there we go:
Jesus: "I have not come to abolish the Law and the Prophets." (Mat. 5:17-19)
Paul: "Jesus abolished the Law on the cross." (Ephesians 2:15)
Epoisses: Jesus and Paul were in complete harmony.
Jesus: "To escape hell-fire, you must listen to "Moses" aka the Law." (Luke 16:29-31)
Paul: "Jesus was the end of the Law." (Romans 10:4)
Epoisses: Jesus and Paul were in complete harmony.
Bottom line: Probably, Epoisses did not know the meaning of complete harmony.