This is a different Rowland Harris from the one who married Elizabeth Kimball.
The Rowland Harris born 1764 was the son of Isham Harris b 1741. He is listed as married 1) Sarah Daniels 2) Elizabeth Reavis.
The Rowland Harris born 1754 is Isham’s brother. He is listed as married (perhaps) Sarah Daniels 2) Elizabeth Kimball.
Obviously there’s something hinky about the 1783 marriage of Sarah Daniels.