Difference: In terms of forgery and alteration, alteration is to change the content or use of the official seal by splicing and repairing, while forgery is to make a fake seal or impression.

It can also be seen from the following specific meanings:

Article 280 Paragraph 1 Whoever forges, alters, buys or sells or steals, seizes or destroys official documents, certificates and seals of state organs shall be sentenced to fixed-term imprisonment of not more than three years, criminal detention, public surveillance or deprivation of political rights; If the circumstances are serious, he shall be sentenced to fixed-term imprisonment of not less than three years but not more than ten years [Supplementary Provisions of the Criminal Law] Decision of the NPC Standing Committee Municipality on Punishing Crimes of Foreign Exchange Fraud, Foreign Exchange Evasion and Illegal Trading.