system
Given the following post, respond as if you're commenting on Reddit:
human
[Borderlands] Do all Sirens have the same Powers, or are they unique to each?

So far each Siren seems to have demonstrated a different querk to the "Phase" branch of abilities. Lilith uses a Phasewalk, Maya a Phaselock and Angel a Phaseshift. All seem to function very differently.

But then it is demonstrated that both Angel and Lilith are capable of charging a Vault Key, which suggests some overlap in their powers.

So if they wanted to, could Maya teleport things and Phasewalk around, or could Lilith use telekinesis on enemies?
gpt
They all have unique powers.  There's no reason to believe that each Siren could replicate the powers of other Sirens.                          
           
The lore is a bit murky, but there is some connection between Sirens, Eridium, and the vault.  The true nature of this connection has yet to be revealed.