The two are different things.
Plasma is the 4th state of matter. It is basically ionized gas. It is difficult to picture it at first but its actually the most common state of matter in the universe. Think about nebulae, supernovas, stars, that kind of stuff.
Blood plasma is simply the liquid (made of water and proteins mostly) in which your blood cells are traveling on. If you place blood on a machine called a centrifuge you will be able to see all the different components of blood. Plasma has a light yellow color.
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