No, just like normal Pokemon games, Pokemon Go has an IV system, which means that two Pokemon of the same species won't have the same max CP. You can have your Pokemon rated by your team leader (for example, Blanche if you're on team mystic) to get a general sense of how good/bad your Pokemon's IVs are, or you can go online and use a calculator (like the one on the silphroad. com) to figure out exactly what your Pokemon's IVs (Or Individual Values) are.
Hope this helps!