Making small changes to your Google Play store page and testing the results is one of the keys to long term success as a self-publisher. Sometime a change that seems quite minor can have unexpected results. Luckily Google have made it easy to test different assets on your Play Store listing by giving us a built-in tool to run A/B tests to compare candidates, The store listing experiments tool allows us to upload a new version of a particular asset, a new app store icon for example, and show that new asset to a given percentage of our store page visitors.
Of course there is a very easy way to answer this question, run an app store experiment!
That's a massive boost to the number of installs from a seemingly minor change to the icon. It really underscores how important the app store icon is to your app's success and shows how important it is to test every variant for performance.