Constitutional Law Ka Mazaa: Doctrine of Basic Structure vs Doctrine of Pith and Substance

Main ye question 3 baar padha aur abhi bhi samajh nahi aaya 😭. Koi bata sakta hai doctrine of basic structure aur doctrine of pith and substance mein kya fark hai exactly? Maine socha hai yeh dono concepts constitutional law mein related hain, lekin ismein fark kya hai. Pith and substance vishesh act ko dekhta hai ke woh central list mein aata hai ya state list mein? Lekin basic structure to whole constitution ko cover karta hai. Lekin kya yeh basic structure ka koi specific definition hai ya phir ismein bhi pith and substance ka scope hai? Koi bata sakta hai toh please batao 😊.