using same variable name for two service type...

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C#

service

I am trying to use two services one i use when i use clients web service i.e in production mode and one local web service when my program runs in test mode, my problem is this that i want to use a single variable name for both the service type and want to decide in run time which service type to be used based on the mode i.e. production mode or test mode but i am getting following error

var res = new CRDGDMS.CRDProcedureInfoStruct();//local service
               var res1 = new CRDProcedure.CRDProcedureInfoStruct();//clients service
               var response = MODE.Offline ? res : res1;

but i get error "type of conditional expression cannot be determined because there is no implicit conversion between CRDProcedureInfoStruct and CRDProcedure.CRDProcedureInfoStruct.

how can i achieve this.any help will be appreciated.

thanks in advance.