Hi Ballydw
Thanks .Without dates a bit of a problem. IF ,they are the same, it means James was probably born in Scotland (his descendants think he was Irish),and probably they were married there, and not in NZ. That they had two children before moving to NZ.?Possibly different people? Hope the marriage cert will shed some light.
Also ballydw, I found the official birth notice for Jane from the birth info you provided, and the surname is spelt with two L`s .NICOLL. When I put that into NZBMD nothing comes up. Nicol is spelt with one L for marriage, and children`s births.
On another family website I found a couple of Family Tree`s giving Jane`s birth as circa 1866 in Kilsyth Stirling, but both give different parents ,being-David Nicol & Christina(no maiden name).
So again hopefully the marriage cert (if it turns out to be for the correct family)may provide the answer.