Pope Eugene IV is not saying the same thing as Pope Benedict and the catechism.
This is what the catechism says:
1258 The Church has always held the firm conviction that those who suffer death for the sake of the faith without having received Baptism are baptized by their death for and with Christ. This Baptism of blood, like the desire for Baptism, brings about the fruits of Baptism without being a sacrament.
Pope Eugene IV ( A.D. 1441 ) " The most Holy Roman Church believes, professes, and proclaims that those not living within the Catholic Church, not only pagans, but also Jews and heretics and schismatic’s cannot become participants in eternal life, but will depart " into everlasting fire which was prepared for the devil and his angels" ( Matt. 25:21), unless before the end of life the same has been added to the flock; and that the unity of the ecclesiastical body is so strong that only to those remaining in it are the sacraments of the Church of benefit for salvation, and do fasting’s, almsgiving, and other functions of piety and exercises of Christian service produce eternal reward, and that no one, whatever almsgiving he has practiced, even if he has shed his blood for the name of Christ, can be saved, unless he has remained in the bosom and unity of the Catholic Church.
" Cantata Domino" Council of Florence
Pope Benedict XVI “Whoever seeks peace and the good of the community with a pure conscience, and keeps alive the desire for the transcendent, will be saved even if he lacks biblical faith.”