IPC se BNS mein kya fark hai Judicial Services k liye

Bhai, main to complete confused hoon. Mera brain kaam karne k liye abhi tak koi idea nahi hai. Judicial Services ke liye IPC aur BNS mein kya fark hai? Main to sochta hoon k yeh dono hi kanooni dhara hain, lekin difference to pata nahi kis baat se hai. Abhi meri class mein Professor sahab ne IPC ka section 377 aur BNS ka section 377 ka lecture diya, aur main to socha k yeh kuch alag-alag cheezein hain, lekin fir Professor sahab ne bataya k in dono hi section 377 hain, lekin to IPC aur BNS mein kya fark hai?