phranque - 3:10 pm on Oct 30, 2012 (gmt 0)
i would think the common ownership would be a strong enough association.
google is a domain registrar so they have access to all this information.
however the domain move as you described will essentially work like a massive link disavowal - the good and the bad.
you should also consider the effect of switching from a gTLD to a ccTLD.