Board Thread:News and Announcements/@comment-25148498-20141031183601/@comment-26397825-20150726074009

...You are obsessed with comparing the Grimm Masks to Arrancars and Visords. The problem with that is if it did happen in show, it would be a blatant rip off, and somehting that even Miles and Kerry wouldn't stoop so low as to actually do (I hope, anyway). Also, Hollows in Bleach are corrupted souls. Grimm have no souls at all. Big difference.

The lack of obvious age differences is because of the art style and program they use - they'd have to literally paint each inidividual wrinkle on everyones face to give them age lines. So they don't bother, and just give you the actual ages of the characters where possible.

So no. Grimm are not synonymous with Hollows and the White Fang are completely different to the Arrancars and Vizards (the only 'magical' masks will have Dust or technological upgrades).