Can I be admitted to a graduate program in Computer Science with relevant work experience, but academic background in Electronic Engineering?
There are cases where you can get admitted even though you have another (closely related) degree because some programs give students a chance to study things on their own, though this usually varies between countries and universities.

Another thing that could affect your chances is the type of computer science that you want to apply for: it's probably going to be difficult to get into a theoretical computer science program (some of my colleagues at my current university have been rejected from a computer science master's program at a respected university because their undergraduate degrees contain the word "engineering"), but it might be easier to get into some more applied field.

The best thing would be to contact someone at your target universities; they are usually able to tell you if you have a chance to be admitted.

Hope this helps and good luck.