[discussion] do the witch of envy and Satella share their memories?

We know that different personality have different memories in disassociative identity disorder. And since Witch of Envy and Satella are different, would they have different memories?(excluding the memories prior to witch of envy was born)

During Arc4, when Subaru tried to suicide, Satella says what did you see in those trials. Does it mean she can't comprehend trial content or does it mean she doesn't have memories of failed loops.

And that raises another question for me. Although the witch of envy/Satella helps Subaru in RbD, do they actually remember the events of failed loops? If yes, who remembers or do they both?