Is there an in-universe explanation, not just about the way they look, but for the fact the Borg behave differently in The Next Generation, compared to First Contact and Voyager?

Guinan's comments about the Borg in The Next Generation imply that they are completely different to the Borg in Voyager and First Contact.

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    – user1027
    Commented Jan 26, 2016 at 17:42