Honora Costelloe

Hello,

I'm trying to find out some information on my gggrandmother Honora Costelloe (nee Stack) of Glengar. 

I believe Honora Stack married William Costelloe in 1841 per Doon parish records, see below:

William Costello
in the Ireland, Catholic Parish Registers, 1655-1915
Name: William Costello
Gender: Male
Event Type: Marriage
Marriage Date: 28 Feb 1841
Marriage Place: Doon and Castletown, Tipperary and Limerick, Ireland
Parish Variants: Castletown, Doon
Diocese: Cashel and Emly
Spouse: 

However, I have found two civil death records for Hanora Costelloe (see below). So, now I am confused as to which one pertains to my Costelloe family. My ggrandmother Anne Sheehy married William and Hanora's son Patrick Costello. However, I believe Patrick also had a sister named Bridget. 

Death of HANORA COSTELLOE in 1898

Name HANORA COSTELLOE (of Glengar)
Year of Death 1898 (Nov 1st)
Group Registration ID 4297813
SR District/Reg Area Tipperary
Deceased Age at Death 75 
Widow of a farmer-died of natural causes
Her daughter Bridget Sheehy (of Cooga) present at death

Death of HANORA COSTELLOE in 1899

Name HANORA COSTELLOE (of Glengar)
Year of Death 1899 (Dec 20 1898)
Group Registration ID 4308558
SR District/Reg Area Tipperary
Deceased Age at Death 75
Widow of a farmer-died of natural causes
Her daughter-in-law Anne Costelloe (of Glengar) present at death

My research also indicates that Hanora Stack and William Costello had 8 children per the Doon Parish records:

Thomas Costello- born Dec 16, 1841

John Costello- born Jan 6 1844

Patrick Costello- born May 14 1846

Hanna Costello- born July 20 1848

Judy Costello- born April 27 1851

William Costello- born Jan 25 1854

Margaret Costello- born Aug 7 1856

Bridget Costello- born Jan 16 1859

QUESTION: 

Is it possible that there were two different people named Honora Stack and William Costelloe that resided in Glengar, Co. Tipperary?  I only located one marriage record from 1841. Is there a second marriage record for Honora Stack and William Costelloe?

Any insights would be appreciated. Thanks.