Legal analysis: No, the first instance and the second instance are the same case, and lawyers cannot represent the other party in the second instance. The authority of an entrusted agent to litigate comes from the entrustment of the parties, the legal representative or the statutory agent, so the entrusted agent to litigate can only conduct litigation within the scope authorized by the principal. An agent can only perform litigation actions within the scope authorized by the principal, and the legal consequences of his actions can be borne by the principal.
Legal basis: Article 39 of the Lawyers Law of the People's Republic of China. Lawyers may not serve as agents for both parties in the same case, nor may they represent legal matters that conflict with their own interests or those of their close relatives.