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If one is praying a nusach which is different to the nusach that the shul is using, is it wrong to answer according to your own nusach?
There may be other practices out there, and it's confusing to learn the responses of another nusach, but Rav Moshe Feinstein's position was that anything communal and out-loud -- including the kedusha response -- should follow the kehilla's nusach.