.NET to PHP+NuSOAP

Hi all, I have software developed with ASP.NET. The program is web service program who communicates with client side - windows application using SOAP messages developed with VB .NET. I have all of the source files from web service project developed with ASP.NET. My question: Is a possible usign same WSDL file from "old" dotNET version of this web service, to develop my php+nuSOAP web service with the same SOAP message as old web service? I don't have the source code for client side. The basically question is possible keeping the old WSDL file and developing the new web service in php usign old WSDL file.