IT IS ALL ONE AND THE SAME GROUP OF GENTILES.....
When John was asked to "prophesy AGAIN before many PEOPLES, and NATIONS, and TONGUES" in ( Rev 10:11 ) he was being asked to prophesy "AGAIN" about his previous prophecy concerning "all NATIONS, and kindreds , and PEOPLES, and TONGUES" which are the "GREAT MULTITUDE" in heaven he spoke of previously in ( Rev 7:9-)
John then complied with that request when he continued to write ( Rev 11:1-2) where he used the word "Gentiles" when he referred back to the PEOPLES, and NATIONS, and TONGUES which he had previously spoken of in BOTH ( Rev 7:9 ) and in ( Rev 10:11 ). They are all one and the same group of Gentiles who are the resurrected / raptured Gentile Body of Christ Church now in heaven, and spoken of as the "GREAT MULTITUDE."
SO, THERE YOU HAVE IT:
The Great Multitude in heaven ( Rev 7:9 ), who are the resurrected / raptured Gentile Body of Christ Church , are also the same Gentiles spoken of in BOTH ( Rav 10:11 ) and ( Rev 11:1-2 ).
According to Your Holy Word, come Lord Jesus !