There are 2 civil parishes called Ballintober, one in Castlereagh barony and Castlereagh Poor Law Union in County Roscommon and one in Co. Mayo. Ballintober is also name of 13 townlands!
If you're certain that Martin was from Ballintober in Roscommon then I suggest you discard the 1843 baptism of Bridget in Aughagower, Mayo. R.C. parish of Aghagower/Aughagower, (Tuam Archdiocese), post town Westport, County Mayo is several miles South-west from Castlebar and a great many more miles due West from Ballintober in County Roscommon. Among nearby parishes to Aghagower parish are Eglish, Ballyhean & Breaghfy parish and Ballintober parish. That Ballintober is South of Ballyhean, which is South of Castlebar. Westport, Castlebar, Ballyhean and Ballintober can be seen on maps. (Having said that, my Gm from Ballyhean married a man from the other side of Mayo whom she'd met elsewhere, away from Mayo, and they later returned to Ballyhean where they had their 2nd son; this was early 20thC in age of efficient & cheap travel.)
The baptism of Bridget in Kilbride parish is more likely. R.C. parish of Kilbride, Kilgeffin & Clontosker, linked civil parishes of Cloontuskert and Kilbride, in barony of Ballintober. However, bear in mind that not all registers survive from this era. Does this baptism include mother's maiden name? If not, it might be another Bridget Hoban with parents Patrick & Mary Ann. How did Bridget come by the middle name Belinda? Middle names were uncommon at the time, except for names like Mary Ann.
Ballintober was in Castlerea(gh) Poor Law Union. The Poor Law Unions were groupings of civil parishes and formed the basis for the Registration Districts when civil registration of births, marriages and deaths were introduced in 1864. There were some changes to districts over time.
See SWilson.info website for help in identifying & locating townlands, parishes (civil or religious), registration districts etc. It has old and modern maps. https://www.swilson.info/index.php
The 1892 Patrick Hoban death was registered in Athlone Registration district, Roscommon Superintendent Registrar's District, Roscommon Union, in Counties of Galway & Roscommon. Roscommon Superintendent Registrar's District was just 1 of several in the County of Roscommon. Patrick was a widower, recorded age at death 95, place of death Ballyglass, occupation small farmer. Informant was Michael Hoban, son, residence Ballyglass. (Don't take recorded age at death as being accurate; a lot of Irish people at this time didn't know their age and no one who knew Patrick when he was young would be around; ages of some elderly people could be wrong by a decade or more.) Athlone is on the far side of Roscommon town from Ballintober. Ballyglass is the name of 3 townlands. Ballyglass in Dysart civil parish in Athlone Registration District /Poor Law Union. The other 2 are in Roscommon PLU, in Cloontuskert civil parih and Cloonygormican civil parish. Athlone became a separate registration district at some point.
Did you consider an earlier Patrick Hoban death in 1872? It was registered in Castlerea Superintendent Registrar's District. This district included Ballintober. Patrick's recorded age at death was 71. That would mean he was born around same time as the other Patrick, if ages were near their actual ages. There's no image of this death registration so no details.
Irish Genealogy.ie
https://www.irishgenealogu.ie.en
County boundaries in this area changed a couple of times in 19th century. Roscommon, Mayo, Galway and Leitrim all lost and/or gained bits. Athlone changed counties as did some other towns.
Were Martin and Bridget single when they emigrated ? Do you know year(s) of emigration?