These two couples left Clare for Australia. They ended up in rural Victoria near Mooralbark and Lilydale
the McNamara's had a daughter with the very original name of Mary
Both families described themselves as farmers on marriage certificate of Michael Smith married to mary McNamara in 1861 so they were well settled in the colony by then.
Probably both couples were married before they came to OZ.
I believe most of the immigration to Australia from Co Clare was between 1849 and 1869 ( but their arrival ,was probably one of the earlier arrivals near 1849 Norag