There is only one Gospel:
Gal 1:6 I am astonished that you are so quickly deserting him who called you in the grace of Christ and are turning to a different gospel—
Gal 1:7 not that there is another one, but there are some who trouble you and want to distort the gospel of Christ.
Gal 1:8 But even if we or an angel from heaven should preach to you a gospel contrary to the one we preached to you, let him be accursed.
Gal 1:9 As we have said before, so now I say again: If anyone is preaching to you a gospel contrary to the one you received, let him be accursed. (ESV)
In Christ there is no "us" and "them":
Gal 3:28 There is neither Jew nor Greek, there is neither slave nor free, there is no male and female, for you are all one in Christ Jesus. (ESV)
Col 3:11 Here there is not Greek and Jew, circumcised and uncircumcised, barbarian, Scythian, slave, free; but Christ is all, and in all. (ESV)
It is worth noting that so far there has been no scriptural reason given for a difference between "kingdom of God" and "kingdom of heaven," and a solid scriptural reason given as to them having the same meaning and referring to the same thing.