as i understand it
they are exactly the same,
made at same factory
just different name is all
now eastmall only sells empty ones,
you fill with your own juice,
so juice mg strength, throat hit and vapor depends on what you put into it. 
I fill my own 808 carts anyway so empty carts are no big deal.
I was wondering more about the batteries. Like would my 808 chargers work with them. It seems I have two kinds of 808 chargers now. One kind has a screw in connection , and one is a post. The new batteries don't work as well charging with the older post type charger.
One vendor I use sells a "new" better battery but they have thier own branding so I don't know if it is really still a kr808. I am wondering if it is just a different manufacturer with an 808 thread. I like the new 808 from them as far as performance, except the loud air noise they make. The noise is so loud (to me) I plug one of the air holes with silicone just to shut it up.
I like EM prices better then the other vendor, so I think next time I order more batteries I will order them from EM instead. Even if I have to order whole kits it will still be less expensive than other place.