Instead of creating your client proxies via the Visual Studio "Add Service Reference" functionality, you could generate them using Visual Studio's command line tool svcutil.exe. Pass in the URL to the metadata for each service and svcutil should figure out what types they have in common.
You should have the DTO in a seperate library. Add a reference to that library in your client project. And you can configure the proxy generation to used object from referenced library.
Right click on your service reference and select configure Service reference there should be an option for Reuse types in referenced assemblies.
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