how to prevent renamed Xcode project from replacing icon on iPhone springboard

Xcode 7.3

My app is installed on my demo iPhone4. I want to quickly create a modified version of my app on the iPhone4, but want to keep the original app also. I changed project name. However, when I run it, it replaced the original icon, shown in springboard, with same icon, as expected, and with new project name.

How can I have both the original app and the new app?