Is it the same for Hong Kong people to buy social security and medical insurance certificates in the Mainland?

Hong kong people buy social security and medical insurance in the mainland, and the numbers are different. The social security and medical insurance numbers purchased by Hong Kong people in the Mainland are generated according to local social security and medical insurance regulations, which are different from those of mainland residents. Take Hong Kong residents who hold the Permit for Hong Kong and Macao Residents to Travel to and from the Mainland beginning with H as an example. Their social security numbers begin with HKG, while mainland residents' ID numbers begin with the number 9. Therefore, the number of social security and medical insurance certificates purchased by Hong Kong people in the Mainland is different from that of mainland residents.