I guess you want to know if the WSDL location of a web service can be significantly different from the web service endpoint address found in the WSDL.
If this is your question, then my answer is yes.
WSDLs may be stored in some kind of repository, perhaps even UDDI as envisioned in the past.
The WSDL is retrieved from the repository but the server on which the web service is deployed may be another computer.
The reason for storing the WSDLs in a repository of some sort may be that you want to be able to change the addresses of the web service endpoints.
By just modifying the address of the endpoint in the WSDL, you can redirect clients to different computers without having to modify the clients in any way.