The location and dates of your two ancestors would appear to make them contemporaries of my ancestor who emigrated to Canada from Ireland and the ages of his children born in Hungerford Twp, Ontario, Canada.
Do you know when/how your ancestors came to live in Canada? From what I know, the Irish tended to migrate together as families to new countries or to areas within a country.
Maurice, b. in 1823, could be the brother of my William Haley, b. 1822. And Patrick, b. 1845, could be the cousin of William's children, the first of whom was born in 1849.
Just a guess, let me know what you think.