Even more specifically, the God of Lies in "Q Who?" suggests the Borg are only interested in technology.
And even if Q was being serious for that rare once, his comment about the Borg interests need only apply on that single moment in time. The Borg there could have been sated with assimilating the J-25ians, and would only have mild curiosity towards the E-D.
Certainly we can't take Q's comments or Riker's observations and interpretations of the Borg as authoritative in any way. Even Guinan's insinuations may be colored by her hatred. This [i]is[i] the first time our heroes meet this radically different species, after all - they are bound to get a good number of misconceptions that won't be sorted out until much later.
Even without "reimaging" TNG in any way, we could say the Borg there were always the same as in VOY. They assimilate Picard by sticking a tubule in his neck, at which point his skin color changes. They could have done the very thing to Riker, Worf or Crusher if they had reached hand-to-hand range - but they didn't, except with Data who couldn't be injected, and Worf, who managed to grab the Drone's arm long enough to prevent the tubules from piercing...