Didn't you read? the one on the left is one of the first sprites he ever did, clearly he made the bannana afterwards when he improved in skill, and looking at the rest of his gallery you can see that the quality is much higher than this avatar -it obviously wasn't made in 2006
well one has a black lining, the other one doesn't... the banana is smooth moving, the thing on the left is VERY wobbly (whatever it is). And I seen more of these little guys, including jalapenos, peppers etc... and they actually MATCHED.
I do not think this is the original... but I could care less. I seen the little banana BEFORE 2006... it's quite old, that alone should be enough proof.
you know. this is one of the few (possibly only?) things of you i dont like. the design isnt really OMGWOW, and the animation is really twitchy.