I didn't pick up the color difference initially, 
just the difference in what was shown in the cel, 
absence of left hand in one image, presence in 
another, slightly different apparent angle of 
right hand ( but that could just be my 
imagination or that more of it is showing in one 
than the other ). Now that you mention it though 
I see what you mean re. the color.

I don't know how you'd tell what source someone 
took a cel from for sure ( I'll leave that up to 
people more "in the know" than me ) but it was 
these differences that made me wonder about the 
possibility of a source other than the original 
cel.

I'm not trying to take sides here either, just 
query what I thought I saw, and your post 
actually made sense wheras my earlier one now 
looks rather confusing to me :D