They join Southern Steel defender Carys Stythe and midcourter Kimiora Poi in the 12-strong squad for Glasgow named this morning.
Kate - who has been named as vice-captain and has been standout for the Adelaide Thunderbirds - won bronze at the Commonwealth Games in Birmingham in 2022, while it will be Georgia's first pinnacle event.
The twins grew up in Heriot and attended both Blue Mountain College and St Hilda's Collegiate.
Kate joined the Steel in 2018, playing 101 games for the franchise before heading to Australia this year, while Georgia - who is captaining the Steel with Poi sidelined - earned her first contract in 2020, after two years as a training partner.
Stythe has been a standout in her second year with the Steel, while Poi was in strong form before a calf complaint ruled her out of the ANZ Premiership.
Her selection and defender Catherine Hall - who had foot surgery last month - are subject to medical clearance.
Karin Burger will captain the squad.
Steel shooter Aliyah Dunn has been named as a non-travelling reserve.
The Glasgow Games will be held from July 23 until August 2.
NZ team
Shooters: Georgia Heffernan, Grace Nweke, Martina Salmon, Amelia Walmsley.
Midcourt: Madeline Gordon, Kate Heffernan, Kimiora Poi*, Mila Reuelu-Buchanan.
Defence: Karin Burger, Catherine Hall*, Kelly Jackson, Carys Stythe.
Travelling reserve: Parris Mason
Non-travelling reserves: Kate Burley, Aliyah Dunn, Tayla Earle, Te Paea Selby-Rickit, Elisapeta Toeava.
* subject to medical clearance
