Do Roman Catholics and Protestants use the same Sunday lectionaries?
The texts in Roman Catholic lectionaries are usually the same as Protestant lectionaries most of the time. There are some deviations where the RCC observes a different feast, especially in regard to Marian veneration or distinctives of RC theology. Look for Daily Mass Readings for daily lectionaries in the RCC. There are also differences between the 1979 Episcopal Book of Common prayer and the new Revised Common Lectionary, but these will eventually be the same. The U.S. Catholic bishops have an on-line lectionary of mass readings here. It’s major drawback is the use of the RC’s New American Bible, a terrible translation not to be confused with the New American Standard. Catholics are allowed to read from a Catholic version of the Revised Standard Version. Please do so.