I am glad Sheri point out the difference.

Comments below are my personal opinion:

I don't really think people should make 
judgements base on two similar images, it is not 
fair, and very injustice

A lot of sequences have 30 or more cels, so there 
will be a lot of similar ones.

I too deal cels, however 99% of my cels are from 
Japan, not from any of the web sites Japan/US or 
Yahoo Japan.

But I am always afraid of selling them, even when 
I need to, because another dealer has or sold 
similar looking cel from the same exact sequence 
on their site.

Here are a few examples, I have 3 cels from this 
Sequence of Hotohori, and Anime Chao had one also 
from this sequence in the last update at $70, and 
compare the fy337 to the one I have below, you 
will see how close they look alike, even knowing 
they are two different cels, and my is A26, so 
there are a lot of cels out there that will look 
like this one and they are not even the same ones.

I seriously doubt any of the cel dealers listed 
on Guide To Anime Cel or Cel WebRing, would buy 
from a site and resell, maybe with exception of 3.