Waton yes the twelve tribes and 12 Apostles are mentioned separately but l think that this is symbolic. As in the 12 Tribes were the starting of God's chosen people from whom came the Messiah, so they are the gates to salvation and the 12 Apostles were the beginning of the church so the foundations .
There is no indication that they receive any different reward than anyone else , certainly no indication that they are dwelling elsewhere. Indeed they are integral parts of the New Jerusalem where God will dwell with his people .
Jan