Bootleg is on the left and the official release is on the right:
I want to point out that the bootleg's hang tag is much lighter and less shiny than the official plush. I know it is hard to see in this picture, but the official plush's tag is very shiny with high quality ink where as the bootleg looks more "washed out".
Overall appearance: bootleg has more sloppy stitching and and more pronounced "scrunching" to create its body, where as the real release is smooth and uniform.
Back: spoltchy patches of color on the bootleg and the coloring is not as saturated
Bootleg has sloopy rings- not very straight where as the official is stitched very nicely. You can also see how lumpy the body of the bootleg is...
Bootleg: lumpy and mishapened star ears... the color of these are much lighter as well and they flop more... aren't as stiff as the official release
The bootleg's stiching in the face isn't as flawless as the official release either. You can see how more mishapened all the stitching is.
Here is a huge giveaway- look at the obvious differences in this picture. The bootleg looks like it has grapes all over it :p it's way more pronounced than the smoothness of the stitching on the official one.
This one made me laugh a bit- the bootleg plush has the year "2014" on it... Cosmog wasn't even a Pokemon until 2016. Notice the difference in the coloring of the tags as well.
Finally the bootleg was made in China as we might have guessed, where as the official was actually made in the Phillipines, which I probably wouldn't have known until I compared these tags!! Funny!
Thanks every one for taking the time to look at this post! I hope it has helped you guys with identifying bootlegs and deciding whether or not you'd want to purchase one! :D