Legal analysis: If the house sales contract signed by the buyer does not violate mandatory laws, that is to say, there is no statutory invalidity; then regardless of whether the contract is handwritten or printed, this Both contracts officially come into effect upon signature, and the validity of both contracts is exactly the same.

Legal basis: "People's Republic of China and Civil Code"

Article 469 The parties may conclude a contract in written form, oral form or other forms. Written forms are contracts, letters, telegrams, telexes, faxes and other forms that can tangibly express the content contained therein. Data messages that can tangibly express the content through electronic data exchange, email, etc., and can be retrieved at any time, are deemed to be in written form.

Article 143 A civil legal act is valid if it meets the following conditions:

(1) The actor has the corresponding capacity for civil conduct; (2) The expression of intention is true; ( 3) Do not violate the mandatory provisions of laws and administrative regulations, and do not violate public order and good customs.