Ok
That's because pre95 public servants pay Class B or D PRSI (a lower rate), don't qualify for a State SW Pension and their Occupational Pension Scheme is non- integrated with SW.
Post 95 people pay class A PRSI, will get a SW Pension and are members of an "integrated" Occupational Pension Scheme (so between the Occupational Pension and the SW Pension you get approximately the same overall pension at retirement)
In terms of the Spouses Pension (and your spouse would also qualify for a SW Spouse's Pension) the difference in the two figures might arise from the fact that you are retiring with c23 years service (whereas full benefits might typically require c 35 years service). I don't know the particular rules of the Garda Scheme, but perhaps you should ask your Pensions Office.