Here you can use verify_response_body_content() method:
self.verify_response_body_content(list, first_list,  Cluster nodes lists for controllers {ctlr1} and {ctlr2} are different.'.format(
                          ctlr1=client.host,
                          ctlr2=self.amqp_clients[0].host)", 3)
But it`s up to you.