Actually not much as mostly these days B.Sc Computers also is a 4 year course but when preceived, B.Tech holds more value on account of it being a technical degree. It is also widely offered by most universities. Some companies dont ask for B.Sc while some do. What you should do is sit and compare the syllabi of both as you must be having the know how of both the courses offered since you asked the question. So go to the syllabus section of the courses and check.

In the long run, what will matter is your knowledge in the field but for starters, a B.Tech always holds the advantage.