Can "become" and "turn into" be used interchangeably?
“To turn into” is to transform.
“To become” is to grow to be.
Because "to turn into" means is to transform, it can be used to mean "transform instantly". However, "to become" seems to imply that the transformation takes time, so it can't be used in the case of a person turning instantly into something through a magic spell.
Is this the case?
The woman turned into a lion, because the fairy cast a curse on her.
The woman became a lion, because the fairy cast a curse on her.