« Reply #1 on: Monday 23 June 14 17:45 BST (UK) »
As far as I know, an important difference is that the birth indexes will have the mother's name listed for earlier years (from the early-1900s) than are available on familysearch.
O'Brien, Keogh, Byrne, Cuffe, Kelly, White, Burke, Blosset, Evans, Hetherington, Hosey, Williams, Wright, Comerford, Carey, McKeon, Litton, O'Reilly, O'Toole, Nugent, Traynor, Broughall.