Yeah, I've seen a few Paperwhites and I'm seeing pretty much the same variation. Thing is, I'm yet to see one that looks like the pictures Amazon shows in their adverts
The Oasis I recently tried actually does look like the adverts to my eye, so that's something. Unfortunately it suffered from dark patches and ultimately didn't feel quite good in my hand vs the Paperwhite or my old KK. Also all the available covers suck compared to the ones available for PW.
So it looks like I'll be sticking with my vaguely blue/green PW for now. It's not bad at all really, it just sits on a weird dividing line between warm and cool that distracts my eye now and then.