What's the difference between Biology and Biological Sciences?

Biology is a general study of living things, both plants and animals. It touches on all of the basics; cell function, mitosis and meiosis, photosynthesis and cellular respiration, the ecosystem, examining plants and animals from simple to complex.
Biological sciences are more specific, and study an area of biology. For example, my specialty is human physiology and cardiology. These are biological sciences, but they are the study of the biochemistry of the human body and its systems, and in particular for me, the heart and circulatory system.
Does this help?

It is the same thing - different universities name the course differently.

Probably nothing really. A biological studies or biological sciences degree is usually just what a university with an extensive biology program with lots of options will call their general degree. At a school that only offers 1 or 2 life science majors, they'll just call it biology.