var client1 = new Client1("Service1");
var client2 = new Client2("Service2");

var clientCertificate = new X509Certificate2(@"path", "12345");

client1.ClientCredentials.ClientCertificate.Certificate = clientCertificate;
client2.ClientCredentials.ClientCertificate.Certificate = clientCertificate;

SetLongTimeouts(client1.Endpoint.Binding);
SetLongTimeouts(client2.Endpoint.Binding);

client1.Open();
client2.Open();

client1.Ping(new RequestData[0]);
client2.Ping(new RequestData2[0]);