Hello, do you mean the handwriting of the contract is different or the person (name) who signed it is different? If the handwriting is different, the validity of the two contracts may need to be determined. Which is the real signatory, and the signature of the person who has the right to sign has legal effect. If the signer (name) is different, as long as the signature is authorized, the signed word is valid.

If in doubt, you can continue to consult. If it is clear, please adopt it.