Practitioners who hold the Practice Certificate of Grassroots Legal Workers are not lawyers, and may not practice in different places, represent criminal cases or defraud cases in the name of lawyers. There are restrictions, and they are generally grassroots service providers serving the vast rural areas.
If you have a lawyer's license issued by various places, you can't use it elsewhere. If you have a lawyer's certificate, you can practice all over the country.
A lawyer must be registered in a law firm to practice. The laws of the place of registration are under the jurisdiction of each region. Lawyers who leave the area where the law firm is located practice in a different place.