The two teams drew 24-24 in Invercargill 10 days ago. But King's were too strong on its home turf.
The battle at Littlebourne between the two Otago Boys' team was a one-sided encounter. The 1sts won 81-0.
Dunstan beat St Kevin's 27-7 in the other premiership match.
In the championship, John McGlashan beat Wakatipu 37-7, Waitaki Boys' edged the Combined Coeds 31-24 and Mt Aspiring eased past South Otago 33-5.