Did you realize there is another kingdom mentioned in Matthew beyond the Kingdom of Heaven?

Kingdom of God

Matthew 6:33 (ESV) But seek first the kingdom of God and his righteousness, and all these things will be added to you.

Matthew 12:28 (ESV) But if it is by the Spirit of God that I cast out demons, then the kingdom of God has come upon you.

Matthew 19:24 (ESV)  Again I tell you, it is easier for a camel to go through the eye of a needle than for a rich person to enter the kingdom of God.”

Matthew 21:31 (ESV) Which of the two did the will of his father?” They said, “The first.” Jesus said to them, “Truly, I say to you, the tax collectors and the prostitutes go into the kingdom of God before you.

Matthew 21:43 (ESV) Therefore I tell you, the kingdom of God will be taken away from you and given to a people producing its fruits.

So is the Kingdom of God and the Kingdom of Heaven the same thing?