Msci physics - is actually a longer undergraduate programme that eventually awards a Masters-level degree (as an integrated Masters) ,it gives you a  comprehensive grounding in physics and mathematics and in this you're guaranteed a government funding.

Bsc physics-is a 3 year undergraduate course, which deals with the nuances of Physics and its various properties.

in short, Msci physics is a longer duration course , somewhat similar to MSc but not exactly and deals with greater aspects of physics and mathematics.

hope that helps

all the best