"Northern   Ireland 458   deaths
The republic 1458 deaths"
six counties to 28 you mean
No!
Northern Ireland population 1.882 million
Republic population 4.904 million.

2.6 times the population in the south
3.1 times the death rate.
you are not very good at this are you? It is always best to compare apples with apples. Introducing oranges is but a distraction to try to mask that the argument is lost.