I think there probably is a connection between these JUDDs.
Is 1815 Susan's birth or marriage date? Do you know her parents names?
I have an Susanna in my tree Christened 1778. I think your Susan is very lkely to be a cousin.
I have a lot more to do on my Judd tree. Most of my Judds are found on the IGI, but I still have to look at the Parish Registers.