The HB Samoa tries, in a match that stood out for the spirit and pace at which it was played, were scored by prop Dennis Tapusoa, fullback Tom Iosefo, hooker Amiga Mikaele, loose forward Toleafoa Faalemiga Selesele, and lock Jessie Lesa Sipaia.
The two sides meet again in a taonga match on September 3.
Meanwhile Hawke's Bay development side the Saracens suffered a surprise 22-17 loss to NPC Heartland side Poverty Bay at the Gisborne Boys' High School Rectory on Saturday.
The Saracens led 12-5 at halftime, against a Poverty Bay side that included Wairoa vet and giant Wairoa Athletic lock Adriaan Brits, from South Africa, and loan player and Napier Tech Old Boys veteran Ted Walters, at centre.
The Central Hawke's Bay sub-union side, having lost its first two matches to Heartland sides Wairarapa-Bush and Horowhenua Kapiti, had a 24-17 win at Takapau on Saturday over Manawatu Maori, who will play HB Maori in Palmerston North on Saturday. Central led 7-7 at halftime, and it was 17-all in the last quarter before the home side scored a late converted try.
The Wairoa sub-union also has a team in training for a challenge in the 100th season of the Barry Cup, presented to Wairoa in 1923 for competition with sub-unions from Poverty Bay and East Coast. It is held by Te Karaka-based Waikohu, who on Sunday won their second defence of the season.
Wairoa last held the cup in 2005.
A last-minute conversion miss ended the Wairoa College first 15's Hawke's Bay secondary schoolboys Division 1 competition for the season when it was beaten 21-20 by Lindisfarne College in Wairoa on Saturday. The final will be on Saturday against the Hastings BHS third 15, who last Saturday beat Central Hawke's Bay College32-12 in their semifinal.
Also on Saturday, Napier BHS hosts Palmerston North BHS in a match to decide who plays Hastings BHS in the Hurricanes schools competition central playoff, for the right to play the top Wellington side for the Hurricanes region title and a place in the national schools Top Four championships.
The central North Island Super 8 schools first 15s, with Napier and Hastings boys high schools just missing places in the final, ended with Rotorua BHS scoring a last-minute try and conversion to claim the title by beating near-perennial defending champion Hamilton BHS 20-19 in Hamilton on Saturday.