I think this question is missing a word – are you asking if when the three of them consecrate the Eucharist, it’s the Body and Blood of Christ for all three? Or are you talking about the three men’s membership in the Mystical Body of Christ, the Church?
My guess is that you’re talking about the Eucharist. Augustine cleared this up a long time ago: the sacraments work because of the faithfulness of God, not man, so we don’t have to worry about a dissident or schismatic priest’s sacramental validity, as long as the form is proper (as the Church understands proper). It’s even possible for the Eucharist to be consecrated illicitly, but still validly. So yes, all three consecrate the Body and Blood of Christ in the Eucharist.
Yes, as long as the priest is a valid presbyter and the form and matter are followed it is the same Eucharist. Truly this is because it is not the priest that is the one consecrating the bread and wine - but Christ - the priest is only acting in persono Christi or in person of Christ.
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