Links on website: & vs. & ... different for Google? Duplicate Content?

ASP.NET MVC Helper made that on the an archive page like …

http://www.finanznachrichten.de/suche/uebersicht.htm?von=10.11.2013&bis=10.11.2013&medium=dpa-afx

… we got these URLs in the HTML:

: [code][/code]

Breadcrumbs in :

<span typeof="v:Breadcrumb"><a rel="v:url" property="v:title" href="http://www.finanznachrichten.de/suche/uebersicht.htm?von=10.11.2013&bis=10.11.2013&medium=dpa-afx" title="dpa-AFX - News vom 10.11.2013">dpa-AFX - News vom 10.11.2013</a></span>

Now the big question:
Is an URL with & for Google search the same as the URL with & OR do I have 2 different URLs (= duplicate content)?

According to this it is different in Google Maps:
http://stackoverflow.com/questions/19678879/why-does-google-not-support-valid-urls-with-amp-in-query-string

What is your opinion?

My opinion is that Googlebot will simply convert the & in a URL to &, like any browser would (except in the source code, of course). Sounds to me like basic functionality for a search engine spider, so I really wouldn’t worry about this.

Also, searching site:http://www.finanznachrichten.de/suche/uebersicht.htm inurl:amp currently returns no results.