They're all... the SAME Gospel of Jesus Christ. And Apostle Paul preached all of those points:
gospel of Grace, gospel of the kingdom, gospel of God, gospel of peace, gospel of Christ, gospel of the circumcision, gospel of the uncircumcision, gospel of your salvation, gospel of our Lord Jesus Christ, gospel of the blessed God, gospel of the kingdom of God, gospel of the grace of God --
these KJV phrases are all... the SAME GOSPEL.
I'm surprised what this is about hasn't been caught yet here on this thread. It's about Dispensationalism's dual gospel theory that has developed over time into more and more ludicrous doctrines:
Are There Different Gospels for Different People?
In essence, its Dispensationalist design came from John Darby who's belief on a secret pre-trib rapture divided a Gentile Church raptured to heaven during the tribulation while the Israelite Church stayed on earth to suffer through the tribulation, and also with the Israelite kingdom restored on earth after Christ's return with Christ's rapture Church still in heaven reigning for the 1,000 years.
Thus the Dual-Gospel theory was part of that design to fit those falsely theorized events that Dispensationalists came up with to try and give power to their pre-trib rapture theory.