§1367
Sacraments › … › V. The Sacramental Sacrifice Thanksgiving, Memorial, Presence
The sacrificial memorial of Christ and of his Body, the Church
The sacrifice of Christ and the sacrifice of the Eucharist are one single sacrifice: "The victim is one and the same: the same now offers through the ministry of priests, who then offered himself on the cross; only the manner of offering is different." "In this divine sacrifice which is celebrated in the Mass, the same Christ who offered himself once in a bloody manner on the altar of the cross is contained and is offered in an unbloody manner."
Source: Catechism of the Catholic Church (Vatican.va)