I am well aware of the difference between deaths and burials. However, Hallmark and I were just pointing out that sometimes there are deaths recorded in registers. Logically, it would be likely that if a priest kept a note of deaths that he was recording details of parishioners and that they might indeed be buried in the graveyard of his church.
The sexton's record and private journal I mentioned do record all the burials in that particular graveyard for the period covered so would show those buried even if no headstone exists.