I'm not sure what they'd be but having just used one I can confirm that they do indeed come in a plain white wrapper and that there's no writing/logos or markings on the blade at all.
However..
Pass one was tuggy as hell and was pulling so badly I thought it was going to cut me. It didn't
Pass two was much smoother but left a lot of hair behind.
Pass three left me pretty much BBS but my chin is stinging like a stingy thing.
Having only Derbys to compare these to I'm not sure. Maybe one's face needs to adjust to a different blade? I can't remember a shave being this difficult and uncomfortable before. The jury's still out.
Maybe I should just shave more often but having said that, when I do think about doing it every day I can feel my skin screaming in protest and so I don't bother. It's normally a twice-weekly thing for me.