Hi my grandfather John Francis Coll born 1839 was transported as a convict to Australia in about 1857-60. He worked his time out on the inland telegraph & then worked in the goldfields in Victoria. Then came to NZ to the West Coast SI & settled & raised 11 Children. My father said he had a brother named Owen who was a sponser at the baptism of John`s eldest girl Mary born in 1877. Could this be the ones you are looking for??
Regards
Mike Coll