You can use virtual pageviews to track them on the same url so the reports make sense.
You will still be able to tell one domain from the other from the hostname report but the urls on the Pages report should now look the same.
eg:
_gaq.push(['_setAccount', ANALYTICS_ID]);
if(document.location.hostname === 'www.aboutexample.com'){
_gaq.push(['_trackPageview', '/about' + document.location.pathname + document.location.search]);
}else{
_gaq.push(['_trackPageview']);
}