Perhaps what's dissimilar is it's, rather than being more geographically directly, it's directed at the Jewish believer, and one of the striking dissimilarities might be the degree to which the writer of Hebrews warns believers, or warns the church as a whole about persevering in faith and not presuming upon their status as members of the household of God. So, the warnings of Hebrews are pretty stark compared to many other New Testament books.
But again, we can return to a similarity which is, say, in comparison to 1 Peter, affirming the pilgrim status of the people of God, that we are not home yet, that the world is not yet a consummated kingdom of God, that though he's been exalted, we do not yet see all things subjected to Christ the way we will one day see them as Hebrews 2 says.
Rev. Michael J. Glodo has served on the Reformed Theological Seminary (RTS) Orlando faculty since 1991 with the exception of six years as Stated Clerk (Chief Administrative Officer) of the Evangelical Presbyterian Church (2000-2006). During that time he has taught Old Testament, New Testament, Preaching, Theology of Ministry, and a variety of electives. He has also served as Dean of the Chapel where he planned, lead, coordinated, and preached in weekly chapel services for many years.