Wasn't there a minor hardware change loosely correlated with the change from red to blue tags? Something about the electrolytic capacitor in the centre, maybe?
Regardless of label colour, the 12 V Victor 884 is legal (avoid the versions with a 24 V fan—the rules don't actually prohibit them, but you'll have a hard time making the fans work).
Red and blue matters when dealing with Spikes—they work differently—but the
Spike Red hasn't been seen in years.