What if the first-generation ID card and the second-generation ID card have different numbers?

Take a copy of the first and second generation ID cards to the government affairs hall for proof. Due to the replacement of the second-generation ID cards, many residents have changed their ID numbers. Citizens who urgently need to use their resident identity cards during the application, renewal and replacement of their resident identity cards may apply for temporary resident identity cards, and the public security organs shall handle them in a timely manner in accordance with regulations. The specific measures shall be formulated by the public security department of the State Council.

Article 12 of the People's Republic of China (PRC) Identity Card Law

The public security organ shall, in accordance with the provisions, apply for the collection, renewal and replacement of resident identity cards. The public security organ shall issue resident identity cards within 60 days from the date when citizens submit the registration form of resident identity cards; In areas with inconvenient transportation, the processing time may be appropriately extended, but the extension time shall not exceed thirty days. Citizens who urgently need to use their resident identity cards during the application, renewal and replacement of their resident identity cards may apply for temporary resident identity cards, and the public security organs shall handle them in a timely manner in accordance with regulations. The specific measures shall be formulated by the public security department of the State Council.