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AFAIK, Excite AU has its own CGI to handle submissions (with a special hidden input field that identifies the submission as coming from excite.com.au), but they don't seem to have any spider IPs associated with them.
So my guess is that Excite AU's passing the submission to excite's database, very much like what Altavista does.
Now if they update just as often then it'll be fantastic :p
Sorry to drift off topic, but my bet's on separate databases, but no doubt Woz will get the answer. (BTW I am optimistic of reappearing in Altavista Australia quite soon thanks Woz)