Differents and similar between Life of Pi and Law of Life

I think the significant about the similarities between the Life of Pi and The Law of Life was these both stories have the same way on surviving in a tough situation, like cold winter and hot summer. The significant about the different between Life of Pi and The Law of Life was Pi never give up to die, this will make Pi having a mental on surviving. But Old Koskoosh just give up to die, If he never give up and go back to the tribe told them that why weaker must be left out? Weaker still can have a freedom to choose survival. This might make Old man survivial and the tradition might gone.