Gamora and Nebula

Regina and Zelena

 * One sister (Zelena and Nebula) is jealous of the other (Regina and Gamora.
 * Both eventually forgive each other at the end. Zelena and Regina forget their sibling rivalry after learning of their brief relationship as friends.
 * One parent (Thanos for Gamora and Nebula and Cora for Zelena and Regina) favored one daughter (Gamora for Thanos and Regina for Cora) than the other (Nebula & Zelena)
 * Also Regina and Gamora gave Thanos and Cora everything while they cast Nebula and Zelena aside.
 * One sister (Zelena and Nebula) both want to bring their sisters down (Regina and Gamora). Zelena wishes to wipe her sister out of existence while Nebula wishes to kill Gamora.