I thought it was said that the Voyager probe stumbled upon some random anomaly in space that took it someplace extremely distant, and that it crash landed on a planet of "machine life" that mistook it for one of it's kind, and they were impressed by it's mission of "learn everything, report back home" so they gave V'ger aid and equipped it with the tools to do just that.
That's very different from the Borg, who appear to be a group of humanoid aliens from another quadrant of the galaxy who embraced technological self-improvement and decided to unify themselves in a hive-mind, and found that the collective was so appealing that they wanted more of it, even if that meant forcing themselves on others.
The only real common thread between the two is "advanced technology", which is nothing new in sci-fi (and the machine planet appears to have been much more advanced than the Borg), and limitless knowledge, which was V'ger's mission, not anything from the machine planet, and which the Borg seemed to think they would get if they only added a few more humanoid brains to their collective.