IPC aur BNS mein ACTUALLY kya fark hai?

Mujhe toh ye sab confuse kar diya hai. Bas hua hi nahi, ab yeh bhi padhne laga hai ki IPC mein jo sections hain, voh BNS mein bhi hain, lekin kuch sections ki definition aur scope BNS mein alag hai. Aur agar koi IPC mein jo section hai, voh BNS mein bhi wohi hai, toh kya hua woh? Aur koi sections to BNS mein hi hain, IPC mein nahi. Mujhe lagta hai ki main kuchh khatra lag rhaa hoon ki ye sab kya hoga. Aur agar koi questions aayenge to main kitna confused hoga. Koi bata sakta hai ki IPC aur BNS mein kitna different hain?