Can two social security companies connect seamlessly?

According to the relevant information, the inquiry shows that: Yes, social security purchased by different companies can be merged. If different companies belong to the same city, there is no need for transfer and merger, and the social security paid by the two companies will be automatically merged to calculate the payment period. If the company is no longer in the same urban area, then both parties must transfer the social security paid by one city to the other party before the payment period can be merged.