Is thrombocytopenia purpura as the same as blood dyscrasia?

Different. Thrombocytopenic purpura (ttp) is an acute condition involving destruction of blood components including red cells and platelets and can be life threatening. Blood dyscrasia is a general term referring to a chronic or inherited blood compnent disorder such as hemophilia, leukemia, thalassemia, etc.
No. In a blood dyscrasia (an old-fashioned term), the blood contains very abnormal formed elements. In idiopathic / autoimune thrombocytopenic purpura, antibodies cause destruction of nice platelets. In thrombotic thrombocytopenic purpura, lack / suppression of a factor for stopping blood microclotting causes devastatic problems despite normal foremed elements.