They may not be the originals (you can't find those anywhere anymore btw), but Wood R4 works on them and that's all you need. (They're 1:1 copies, so basically what you get is the same as an original)
They are 1:1 clones, which are exactly the same but made by a different company, so in a way, they are the official ones. Oh and they are guaranteed to work with wood.
Technically, they're clones. But they're 1:1 clones of the original R4, so they might as well be 'original'. WoodR4 is confirmed by many (myself included) to work on these carts.