I wouldn't say they were totally new.
Both are slight adaptations of already released sets. Although both used to have mounts then .
But whatever - they are both great; but I prefer the black knight. He's awesome ... even with the new helmet.
I hadn't noticed the new helmet ... He looks good, indeed!
I like the golden knight. Useful simple parts, specially the torso. I'd like they made a silver one. Exactly like that.
BTW - what's the difference between a helmet and a helm
Bogro
Helmet is used for modern apparati too. Policemen, firemen use helmets. The word "helm" looks to me a bit archaic, and "poetic". I'd say there's no difference between a medieval/ancient helmet and a helm, but there's no modern helm, unless you make a poem, talking about a policeman as a knight ...
I'm a(n apprentice) philologist, but not a native speaker, though ... Maybe there's something else I don't know.
This is what I can give you for the moment.
Gus