David
They possibly could be, I have a James Crawford then his son a John Crawford who was born in 1750
I don't suppose you have a photo of those gravestones, or know what was written on them?
Looking back on their descendants I see John had a son Robert 1780 - 1834 who married Rose McElheron, they had a son Charles 1820 - 1891 who married Mary Jane McKay, both of whom are buried in the Clough cemetary, so I would say there must of been a tie in there somewhere!
Cheers
Alan