A death registered on Lancashire BMDs
William Mosley aged 50, death registered Hulme, 1843. So suggests a birth year of 1793.
Equivalent registration on Free BMDs is 3rd quarter 1843, Chorlton vol 20, page 150
This age could be as approximate as the 1841 census age of course!
Another possible baptism 9 Jul 1797 at Manchester Cathedral
William Mosley – son of James Mosley & Martha
These obviously don’t answer your question definitively, but they do give two clear possibilities.