Hello!
Take a look at
http://toolserver.org/~flacus/IWLC/.
I will bot the data with my flabot.
You should ask if the articles are about the same only if they have not interwiki to any
the same language.
Example it demands about
http://eo.wikipedia.org/w/index.php?title=Monchy-Cayeux&oldid=1601554
and
http://pt.wikipedia.org/w/index.php?title=Monchy-Cayeux&oldid=11204530
It is not nesesssary, both have link to [[:es]].
Maksim