Not Same website on IPv6 and IPv4

Hi,   To check us web-sites we use   By one site we get a alert that the site is not the same on IPv6 and IPv4.   "Verdict: Avaliable ports or offered headers of your website over IPv4 are not the same over IPv6. Test explanation: We compare the response and content received from your web server over IPv6 with that received over IPv4."   My question is : why is the response different? can you configure different headers for IPv4 en 6? And Where?   Thank you, Pascal    
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