Yes a different one that denies the grace of Christ as to the fullness of His grace coming from his labor of love or what scriptures call a work of His faith . They offer a unknown remnant with the remainder as a work they can finish in a unknown place (purgatory )for a unknown amount of time, and a unknown amount of severity. And call that the gospel .
The sacrificial mass is at the heart of it. It's a non bloody sacrifice which is offered up for sins, and the priest claims to have the power and authority to bring Jesus down from His throne... that Jesus obeys the priest, and is then offered up repeatedly in each mass. It's a complete rejection of Jesus and His ONE perfect sacrifice for sins forever. By adding to the work of Jesus on the cross they are saying that He alone is not sufficient to save anyone.
It reminds me of this scripture....
Hebrews 10:11-18:
"And every priest stands ministering daily and offering repeatedly the same sacrifices, which can never take away sins. But this Man, after He had offered one sacrifice for sins forever, sat down at the right hand of God, from that time waiting till His enemies are made His footstool. For by one offering He has perfected forever those who are being sanctified.
But the Holy Spirit also witnesses to us; for after He had said before, “This is the covenant that I will make with them after those days, says the Lord: I will put My laws into their hearts, and in their minds I will write them,” then He adds, “Their sins and their lawless deeds I will remember no more.” Now where there is remission of these, there is no longer an offering for sin"