The two, who in 2003 won the New Zealand intermediate and senior titles respectively in Te Kuiti, were also the two fastest in Friday's heats (with the same time) and semifinals (separated by just 0.1sec).
In the final, both finished more than a sheep ahead of the next man off, Napier-based Northlander Doug Smith, and two sheep ahead of the other finalist, Feilding's Murray Henderson.
Ferguson, winner of a second New Zealand Spring Shears title a fortnight ago in Waikato and last weekend runner-up to Kirkpatrick at the Poverty Bay Show, also produced the best combined board and pen quality and claimed victory by a comfortable 3.1pts.
Masterton-based Riverton shearer Caisey Bailey, 22, a late-bloomer last season when he made three senior finals, including third at the Golden Shears, had his maiden victory by beating former prolific junior and intermediate winner and second-year senior competitor Michael Riolston, of Levin, by more than four points in Friday's senior final.
Catherine Mullooly, of Matawai, won the intermediate final, emulating a feat achieved by fellow female shearer Ingrid Baynes in 2008, and Marley Waihape, of Mataura, won the junior final, having earlier incurred just two penalties in board judging of his two sheep in the heats. Flaxmere College student Whakapunaki Maraki, 14, won Hawke's Bay's first novice schools event, held in front of just a few people on the first day of the show, and repeated the effort in a novice shear in front of the capacity Great Raihania Shears crowd.
Gisborne competitors made a clean sweep of the three woolhandling events, headed by world and Golden Shears champion Joel Henare, whose open final win completed a successful defence of the Poverty Bay-Hawke's Bay double he won last year.
The runner-up was Maryanne Baty, also of Gisborne.
Foonie Waihape won Friday's senior woolhandling title, in her first New Zealand final since finishing runner-up in the 2012 Golden Shears, while Vivian Taitapanui scored a maiden victory in the junior final.
There were 76 shearing entries and 40 in woolhandling classes in the 10th Great Raihania Shears since a shearing competition was revived at the Hawke's Bay Show in 2004 and named after pioneering shearer Rimitiriu Raihania.
At the Hawke's Bay A&P Show in 1902 he won what is thought to have been the first machine-shearing competition in the world.
There are four more North Island competitions before Christmas, with the Wairarapa Spring Shears next Saturday at Carterton, the CHB Shears a week later in Waipukurau, the Stratford A&P Shears on November 23, and the Royal Show Manawatu Shears at Manfeild on December 8.