CSE is a core programming and coding field where study emphasis is on knowledge of coding
But in IT it not about only coding , it about some electrical engineering concepts also . It is mix of CSE and ECE field . You are taught how to apply CSE coding on embedded systems platforms . As all computers are embedded systems .
CSE develops and IT employs the program
But although course structure is almost same in first three years of B tech . Only in last year subject are somewhat different in both branches . Some are even same in last year