Question: is big boss the same as solid snake

Answer: No, Big Boss is one of the central characters of the Metal Gear series created by Hideo Kojima and developed and published by Konami. Introduced in the early entries of the series as the commanding officer and subsequent nemesis of his son Solid Snake, he is later featured in the prequel games as Naked Snake, an American Special Forces Operator and decorated war hero until political manipulations cause him to be disillusioned and start his own private mercenary company.