Both paintings were made by Pablo Picasso. These pieces are similar because one of them is the sketch, and the other one is the final art. About the purpose, it depends on what you want to know. If by the purpose you refer to the reason they had made, so it was to show how the cubist art was portrayed, and that beauty can be seen and expressed through many forms. Now, if by the purpose you mean why he made two, then the answer is one it was served as a guide to the final piece.
