I read this a few months ago it was about two boys they went to a school the one that I believe was the top had dark hair and the bottom had light hair.
The top was the top student in class whilst the bottom was a delinquent. I think that one day the delinquent was sneaking into school and he was jumping over the wall when the top student was below the wall and they hit each others head.
Then they switched bodies and had to pretend to be each other in front of their friends.
They started getting closer and had multiple switches but soon the delinquents mom found out her son didn't remember that she was allergic to some fruit and accused him of being an impostor but the top student lied and said he had another identity lol 😀 🤣