Is Sara Harvey actually Bethany Young!?

Hi everyone, so did everyone watch Pll first episode of season 6? I did....And really......OMG. But I think Sara Harvey is no other that Bethany Young. why would she pretend to be Sara?? Well, Maybe Charles had Bethany to play Sara, To recreate the whole of ''That Night'', Because he wants to make them suffer, like he did, and number 2. Because if she said she Bethany Young, She would have to go back to Radley, Maybe she didn't run away, maybe -A Kidnapped her??