Actually, following the referendum the legal position is the same in both parts of Ireland.
In both cases abortion is only legal in a limited number of circumstances. In both cases the parliamentary body for that part of the country has the power to change that situation.

The differences are that in one case there is a parliament in existence, the Dail, and that is preparing to legislate to widen access to abortion, whereas in the case of Northern Ireland, the Assembly is suspended, and if it were reconvened there is good reason to expect that it would not carry out such legislation.

I think it is better to keep this discussion to the political issues rather than to broaden it into exchanges about the ethics of abortion and about religion. (In the context of Northern Ireland the divisions aren’t really about religion as religion, but rather as a marker for ethnic divisions.)