You probably installed the "Maps Shortcut" app.
Prior to 8.1, if I understand, Nokia phones had the traditional Bing Maps removed from the app list. The Bing Maps shortcut app brought it back.
I too have both of them there. I'm keeping the extra one, in case the Cyan update were to remove it again. If that's not the case after the Cyan update, I'll delete it.
CFC