Do you think the two families are linked?
Looking at Irish Genealogy as linked by Hallmark, I can see other members of the Dunowla Finans in marriage. I have only looked at a couple and there is a Catherine and a Bridget marrying with father Michael for example.
I am not sure what you are trying to establish. Do you think that Michael in family 2 is a descendant of Michael in family 1?
Heywood
One has to be very careful linking anyone in same townland as my wife found out!
We had just moved here and talking with a couple in next house Frank and Mary X
Next morning at the shop people told her that Frank X dropped dead during the night.
My wife was on the way to the house when she met another neighbour and they were talking about it. My wife said she was only talking to him and his wife the day before.
The neighbour said... "but he wasn't married!"
It turned out to be the other Frank X who lived in house opposite and absolutely no relation!
There are only 12 houses in townland!!