E=mc2 = All the matter (m) is divided into atoms and then protons, neutrons,electrons, misons, alfa rays, gama rays etc so combination of these small particles except first two is called light (c2) what kind of matter it is, finally if divide the matter by particles it became light. As far as Einstein's theory by multiplying the matter with speed of light equal amount of enery is released.
By combination of physics and chemistry theory each matter varies by their atomic number (Ex: U235, gold 79 etc..)
Would it be possible to release equal amount of energy when we applied to E=mc2 with different type of matter we use ?