Hello,

So the main difference is that  computer science engineers actually write the programs and IT  install and use it effectively.

If we define,

Computer science engineers (CSE) are involved in many perspectives of computing, from the design of microprocessors, PCs, supercomputers to circuit designing, and writing programs that power them.

Information Technology (IT) involves the use of computers and software to save, preserve the process, transmit, and securely recover data. IT professionals deliver a diversity of tasks that range from installing applications to designing complex computer networks and information databases

Hope it answers you.