Hi,
The Griffith Valuation lists a Christopher McAuley, Town of Emyvale. At about 1860, that's well after the dates you're interested in, but it may still be an avenue worth pursuing to see if there was a common ancestor.
There was a Rev James McAuly listed in the 1796 Flax Growers register for Muckno, Monaghan.
Church records for Monaghan are not available on-line. In any case, your dates are probably before the records that do exist.
Research in Monaghan is not easy . . .