Check to see whether the properties both contained a house, because you do often get someone with a farm in one place and then extra land nearby in another. So is it a house, offices and land in one townland and just land in another?
In my experience, where someone had property in more than one townland Griffiths clerks usually noted that by putting the main residence in brackets after their name, in the townland where they didn't reside. So if there are 2 houses in Griffiths and no note about a second townland, my feeling is that there are probably 2 different people of the same name.
It is possible to trace forward to see what happened to the properties using the Valuation Revision records (in the Valuation Office in Dublin). That can also assist in determining who lived where.