If you have 2 identical pages, both indexed and listed in google from different domain names - then you are simply lucky that the duplicate content has not yet been spotted.
Either that or google have dramatically changed the way they do things and none of the SEO world know about it yet. (unlikely)
Many many sites have lost their listings in google and cannot get them back due to a mirror of the site being set up - it is a common problem.
P.S. - contradict away - I have no problem with people opposing my posts - I love debate - its how we learn