Porter, Virgil V. “The Sermon on the Mount in the Book of James, Part 1,” BibSac 162, no. 647 (July-Sept. 2005): 344-60.
This article contains a helpful chart of all the verbal parallels between the Sermon on the Mount and the Book of James. It also highlights shared topics: law, wealth and poverty, speech, prayer, trials, temptation, perfection, wisdom and folly, judgment, righteousness, people (this list is drawn from the article’s section headings). Part 2, which I did not read, covers parallels organized by the categories of systematic theology.