BoogerMan
The R&F JW's are defined by the WTBTS as antitypical "foreigners," and as such, are not participants of the New Covenant:
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The answer is simple. Under the Law Covenant the Israelites along with foreigners formed a community under that arrangement able to worship Jehovah God according to the terms and conditions prescribed by that covenant.
The New Covenant was a more intimate or restrictive arrangement made by Jesus Himself and by personal invitation to prospective members who would become the Bride of Christ.
To illustrate you may have a small group of friends that all associate together under mutually agreed social norms but if you wish to choose a bride or groom then this is a more personal decision or an intimate again having different terms and conditions as prescribed by any covenant which of course marriage is a covenant between two people.
Thus there is a vast difference between these two covenants but also strong similarities for both describe Jehovah's worship through time etc.
scholar JW