If I understand your question correctly, you are asking if it is possible to have a site designed with XWD and then, at the push of a button, apply a new template and have a totally different look while retaining all your text and pictures. If that's your question, "no" is the answer, XWD is not an application that produces 'canned' websites.
XWD is a website design program that uses templates to help you get started (and even build complete websites with them), but really aims to assist you in creating your own unique website adapting those templates and/or creating your own.
In doing so, as spudmachine already explained, the program has various functions -- such as 'Repeating Objects' and 'Named Colors' -- that give objects a template-like character which allow you to change recurring design elements on the fly. This approach gives the user much more freedom and allows you to mix-and-match existing templates with your own designs (for which XWD offers you a pretty nice set of tools).
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