Burial records for Killinick Church of Ireland are available at the RCB Library in Dublin, these cover back to the 1760s, there seems to be some records for the parish in the National Archives. Early records for Taghmon are listed as lost, but burials from 1877 onward survive, also held by the RCB Library.
I suspect that a burial in Killinick would be more likely.
Killinick graveyard is included in Cantwell's survey but no mention of any Ross, but bear in mind an 1884 headstone might not be included, and also there may not be a headstone..