[ealgeone]

Q. 921. How is the Mass the same sacrifice as that of the Cross?

A. The Mass is the same sacrifice as that of the Cross because the offering and the priest are the same -- Christ our Blessed Lord; and the ends for which the sacrifice of the Mass is offered are the same as those of the sacrifice of the Cross.

http://www.baltimore-catechism.com/lesson24.htm

[maryz]

Yes -- the same sacrifice, not a "resacrifice." The sacrifice itself is eternal -- the form it took in time was Calvary.