What is the difference between municipal social security and district social security?

Similarly, social security in Chengdu has also been co-ordinated, and social security in any jurisdiction in Chengdu can be found in other districts. It used to be different. Social security transfer needs to be transferred across regions, and social security cannot be queried across regions.

Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.