The two phrases are separate. The Kingdom of Heaven is a physical, literal kingdom promised to the Jews. It is the covenant God made with Abraham. The Kingdom of God is a spiritual kingdom for the Gentiles, i.e. Christians in the church age. Dr. Peter S. Ruckman's "Sure Word of Prophecy" sermon is a great resource for information on this.
The two phrases are separate. The Kingdom of Heaven is a physical, literal kingdom promised to the Jews. It is the covenant God made with Abraham. The Kingdom of God is a spiritual kingdom for the Gentiles, i.e. Christians in the church age. Dr. Peter S. Ruckman's "Sure Word of Prophecy" sermon is a great resource for information on this.