Duplicate app icon in our apps

We have two apps with same app icon. One is live on app store while other got rejected due to duplicate app icon. The apple team has asked to change the app icon in order to be able to differentiate it from our former app. We are looking for minimum changes to the app icon. Can we just change the background color of the app icon and resubmit the app?

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Duplicate app icon in our apps
 
 
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