iphone：使用具有不同构建目标的不同图标？

Right now I have a regular iphone app with unique springboard icon and splash screens. Now I want to create basically the same app with minor changes - and this app will have a different name, different springboard icon and different splash screens. So basically what I did now was to duplicate the original build target - but how do I add another icon.png to my project and tell XCode to use the relevant icon for each build? And what about the splash screens? Right now I have a regular iphone app with uniq