Question: Were they meant to be the same entity?

If they weren't, does this imply that Borg have distinct "hives"?

Out-of-Universe, the actresses playing the roles were all mixed up, but sounds like Paramount originally wanted the same actress implying it was the same Queen (or merely that all Queens are 'clones'?):

From <http://www.imdb.com/name/nm0860749/> (Susanna Thompson):

> 
> **Trivia**: Got the role of the "Borg Queen" on Star Trek: Voyager only
> because Alice Krige (who played the role in the movie Star Trek: First
> Contact) refused to reprise her role.
> 
> 
> For the final episode, Susanna Thompson was not available (because of shooting *Once and Again*) so Alice Krige played the Borg Queen in the final episode.
> 
> 
>

Answer: 
My wiew on Borg Queen is that she is not a real person but actually an avatar of Borg collective itself. An living embodiment of the whole Borg collective, put in one body. And that would explain how can there be so many Borg queens. The fact is there isn't really a Borg queen as a leader who governs all, but a living representation of the collective itself.
She said in First Contact that, the Borg before her it was just havoc and chaos, where the Borg where (running around like a chicken with its head cut off) when she was assimilated she took over and brought unity and formality to the collective.