The first is the passage in the preparatory draft, and the second is the passage in the final draft. The Acta Authentica SS. Oecuмenici Concilii Tridentini in the link above contains the preparatory and final drafts.
Latin
Preparatory: "...quae translatio post evangelium promulgatum lavacro regenerationis, aut eius voto efficitur..."
Final: "...Quae quidem translatio post evangelium promulgatum, sine lavacro regenerationis, aut eius voto fieri non potest...""
English
Preparatory: "...this translation, since the promulgation of the gospel, is effected by the laver of regeneration, or the desire thereof..."
Final: "...This translation, since the promulgation of the gospel, cannot be effected without the laver of regeneration, or the desire thereof..."