Of course it's different. Paul never preached the gospel of the kingdom. Paul's gospel was called the gospel of the grace of God or the gospel of Jesus Christ.
The gospel of the kingdom was for the Jews only. Paul's gospel is for everyone. Why the difference? The Jews earthly kingdom is not to be preached to the Gentiles or Samaritans.
The gospel of the kingdom was for the Jews only. Paul's gospel is for everyone. Why the difference? The Jews earthly kingdom is not to be preached to the Gentiles or Samaritans.
The promise made to Abraham was that all nations would be blessed through him.
The gospel has always included the gentiles, right from the start.
Even under the law, the gentiles were allowed to be in covenant with God. (unconverted God fearing gentiles-Acts 17:4)
The inheritance of the kingdom is for them too. Always has been.
One and the same kingdom/ inheritance message.