What's the difference between social security cards in Shaoyang and Changsha?

There is no difference. The social security card is Shaoyang's and Changsha's. Social security, that is, social insurance, refers to a non-profit social security system with income redistribution function. It is to prevent and share social risks such as old age, unemployment, illness and death, realize social security, and force most members of society to participate. The social insurance plan is organized by the government, forcing a certain group to use part of its income as social insurance tax (fee) to form a social insurance fund. Under certain conditions, the insured can get fixed income or loss compensation from the fund.