I'm not sure if they'll keep the same class interactions from their gauntlet version but the relevant ones are
>Flare and Grand
Flare has mutual resistance to Mooncancer
Grand has mutual resistance to Avengers and mutual weakness to Mooncancer
Shielder resists both
>Aqua and Stella
Aqua has mutual resistance to AE
Stella has mutual resistance to Pretender, and mutual weakness to Foreigner and Beast