The first text is the result of the liturgical "reforms" carried out under Pope Urban VIII
The first version you posted (third line: "sacrata in abstinentia") is the older version; and the second (third line: "in hoc sacro jejunio") is the version Pope Urban VIII issued in 1631.
To participate in the discussions on Catholic church music, sign in or register as a forum member, The forum is a project of the Church Music Association of America.