No, these are the same Marshes. Montgomery Marsh married my great aunt, Hattie. Hester Manning (Hattie's sister) married my grandfather, Lonnie Marsh, Montgomery's cousin. Montgomery and Hattie plus children eventually moved to Westernport, Allegany Co., Maryland. Lonnie and Hester plus children moved first to Loch Raven, Maryland and then joined Montgomery and Hattie in Westernport. All four are buried in the Philos Cemetery in Westernport. I am the daughter of Lonnie's middle son, Clifton, and I was raised in Westernport.
I know the Marshes are from the Culpepper area because Dad always referred to it and I met Dad's aunt Daisy who lived there.