Do you mean the application icon? You can manually edit the project file and enter a code similar to the following:
<PropertyGroup>
<ApplicationIcon Condition=" '$(Configuration)' == 'Version1' ">Icon1.ico</ApplicationIcon>
<ApplicationIcon Condition=" '$(Configuration)' == 'Version2' ">Icon2.ico</ApplicationIcon>
</PropertyGroup>
<ItemGroup Condition=" '$(Configuration)' == 'Version1' ">
<Content Include="Icon1.ico" />
</ItemGroup>
<ItemGroup Condition=" '$(Configuration)' == 'Version2' ">
<Content Include="Icon2.ico" />
</ItemGroup>
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