Talia al Ghul and Elektra Natchios spring from the same stock
The League of Assassin and The Hand spring from the same stock
Both secret ninja organizations that are super old
Both obsessed with resurrection/immortality
Talia and Elektra often (but not always) have a very complicated relationship with their fathers/father figures (Ra’s for Talia, Elektra’s father and Stick for Elektra)
Talia and Elektra are love interests whose relationship with Batman and Daredevil is doomed
Both have periods where they are more heroic/anti-heroic (Talia in Death and the Maidens, Elektra in the current Daredevil run)
Both Talia and Elektra tend to have agency taken away from them a LOT
Both Talia and Elektra have periods where they become leaders of factions or the whole of the League/Hand
No Ra’s figure in The Hand - Stick has some of the same kinds of resonance, but isn’t really the villain or the head.
No “Chaste” equivalent for the League of Assassins, though they’ve been multiplying them recently, with Leviathan, League of Shadows, and League of Lazarus
Talia and the League created in 1971 by Denny O’Neil, Elektra and The Hand created in 1981 by Frank Miller - though it’s fascinating to observe that both Denny O’Neil and Frank Miller made huge contributions to both Daredevil and Batman, and O’Neil was Miller’s editor in his run on both Daredevil and Batman. The thread of Eastern philosophy, religion, aesthetic, and martial arts ran through the creations of both men in a deep vein.
The League of Assassins is basically run for ecoterrorist reasons, though Talia’s reasons tend to be much more about power rather than her father’s ideological motives, while the Hand seems to be much more just about power and…Cthulhu?