The Joshua Roylance I've posted about before is the son of a Joshua Vernon Roylance (Let's call him JVR for now.). JVRwas christened September 1790 in Wilmslow, his father was Samuel Roylance and his mother was Nancy. Now...that is a generation too old for your Samuel.
But, in the letter from Joshua Roylance (son of JVR) that I mentioned in earlier posts on this forum, he mentions"Uncle Samuel". Which is all a very convoluted way of saying that perhaps your Samuel and my Joshua Vernon Roylance *might* be brothers. Just a guess, and the uncle might be from the other side of the family for all we know, but thought it might make for an interesting lead to check.