If the contract signed by the enterprise is established according to law, even if the official seals overlap, it will not affect the validity of the contract.

The difference between official seal and private seal:

1, different representative identities

The official seal refers to the seal used by organs, organizations, enterprises and institutions. Personal seal is only used as a sign of personal identity;

2. The carving procedure is different.

The official seals of party and government organs, enterprises and institutions and their internal organs shall be engraved at the engraving factory or engraving shop approved or designated by the public security administrative department of the public security organ where the unit is located by the certificate or letter of introduction issued by the unit. Personal seal does not need public security approval;

3, the use of different systems

The use of the official seal of any unit must strictly abide by the leadership approval system, that is, every use of the official seal of the unit must be approved by the legal representative of the unit or the person in charge authorized by the legal representative, and the specific management personnel shall not use the official seal of the unit without authorization. The personal seal represents an individual and does not require approval.

To sum up, if the two official seals have legal interests, even if they overlap, it will not affect the interests of both parties.

Legal basis:

Article 490 of the Civil Code of People's Republic of China (PRC)

If the parties enter into a contract in the form of a contract, the contract shall be established when the parties sign, seal or press their fingerprints. Before signing, sealing or fingerprinting, one party has fulfilled its main obligations, and the contract is established when the other party accepts it.

A contract shall be concluded in written form as stipulated by laws, administrative regulations or agreed by the parties. If the parties do not do this in writing, but one party has fulfilled its main obligations and the other party accepts it, the contract is established.