Church of Scotland is Presbyterian and Church of Ireland is Anglican. There certainly is a distinction that might have a bearing on where they are buried. In Scotland, the Anglican Church is called the Episcopal Church.
I would suggest contacting the Mitchell Library in Glasgow as an initial step - contact details are given at http://www.glasgow.gov.uk/en/Residents/Library_Services/Family_Loca... The Mitchell hold some burial registers but others are still will the the Glasgow Council cemeteries and crematoria department.
A list of the main burial grounds in Glasgow is given at http://www.glasgow.gov.uk/en/Residents/BirthDeathMarriage_Citizensh... along with contact details for the cemeteries and crematoria department.
Often you need to know what cemetery someone was buried in before you can request a search of the records so, if you know the dates of death, it might be a good idea to start by looking for a death notice in a local newspaper which might indicate where the burials took place. Newspapers are also held at the Glasgow Mitchell Library.