I can't give you a definitive answer at the moment but you are obviously correct that it is not a coincidence. I too have looked at Alan Williams' book for further info but without success. All I can tell you for now is that I think Henry Pascoe's wife was named Elizabeth and they had 2 (at least) children whilst he was working at the Berehaven Mines:-
Henry Albert b.21/06/1855 and Joseph b.09/11/1857.
As my project continues I expect to uncover further details which would be of interest to you so you may wish to note my email address which is
kenmason3@sky.com.