Hello Nishu.

See these two streams are not much different from one another. In btech IT u would be getting a degree of engineering and taught the portion which will be gonna use in the engineering doped fields in the workplace. For B.sc IT u would be getting the degree of the graduation and ur course duration is also of 3 years , one year less than the btech one. Mainly there is not much difference in these two but some portions in the study differ a bit.

Hope u got ur point. Ask if any query

Good luck