Yes! "The Pastoral Provision is a generous arrangement made by the Holy See in 1980 for those who were formerly priests and laypeople in the Episcopal Church and who now wish to enter the Roman Catholic Church while retaining some of the elements of their Anglican heritage and customs." [Source] "The creation of the 'Anglican Use' parishes stemmed from the statement made by Pope John Paul II in 1980, as a result of a proposal from the bishops of this country to develop terms under which former Episcopal clergymen and other members of the Episcopal Church could be admitted to full communion in the Catholic Church while still retaining some elements of their liturgy, tradition and devotional life."[Source]
Anglican Use parishes are 100% Catholic, 100% in union with the Pope, and 100% loyal to the Bishops and Magisterium. We have "no affiliation with the so-called 'Continuing Anglican Movement,' nor with any branch of the Episcopal or Anglican churches. Rather, its members, many of whom are converts from the Episcopal Church, have been granted permission to retain some elements of the Anglican liturgical heritage while being fully Roman Catholic.." [Source]
So don't worry -- the Anglican Use parishes are completely Catholic, and celebrate the same Mass that every other Catholic Church in the world does -- and are more traditionally liturgical than many! Keep in mind that "[w]hile the liturgy used" in the Anglican Usage of the Roman Rite "is not a separate Rite, it is the only approved variation of the Latin Rite in the United States." [Source]
I hope you'll pay a visit to the 100% Roman Catholic Congregation of St. Athanasius in Boston. You'll be glad you did!
Yours in Christian Fraternity,