There is also when you parents or family members tell you stories of when you were kids and many years later you remember them but now you can't tell if you actually remember them or someone told you about it
Of course, maybe I just remember the memory me replaying the memory to myself. Is there a meaningful difference even? Maybe all our memories after some time become blended with our re-narrating them and re-interpreting them.
There's no meaningful difference on how you experience it as "real" even if its just a "re-enaction" of such reality, but it might help explain why so many humans remember things from their past slightly differently than they actually happened.
This can also serve as a trauma-recovery mechanism, allowing one to not remember stuff too traumatizing etc, the brain blocks it out or rewrites it as a dream, or whatever