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Just looking at it as compared to the Ferrari F60, the nose is visibly different, and the front wing appears a lot simpler. There is also a more substantial, sculpted "feel" to the sidepods and rear body work, probably due to fewer aerodynamic turning vanes than the F60 has. Also interesting is a more substantial shark fin on the back of the air box.
Here is a blog post comparing the F60 and the TF109 side by side.