Blood money (Diyyah) is a penalty and compensation money to be given to the family of the person who was killed to compensate the financial loss. If the killer committed the crime deliberately then he must be punished and Diyyah will not be enough.
Diyyah of man is more then the Diyyah of woman because man is usually the person who works and spends on his family and the financial loss of his family is much more.
Wassalam