If you work in a restaurant or supermarket, you must apply for a food certificate. You wrote a certificate in a public place, which is not acceptable. Because the food certificate is valid for one year and the local validity period is two years. After the food certificate and physical examination, you need to participate in a health knowledge training, and the place does not need training, although the physical examination content is the same. At the time of inspection, your certificate of origin cannot replace the certificate of food, but in general, the certificate of food can replace the certificate of origin, because the certificate of food is more strict.
Your friend said that all cards are the same, because some cities have implemented one card for a period of time, regardless of these two cards, but Shenyang has no such statement.
I suggest that if you go to a large unit or supermarket, you'd better change this food certificate, or ask the department head to see if you want 100 yuan.