Not really, in the first film Megatron and the Decepticons wanted the All-spark for their own gain, and that was to eradicate the entire human race and dominate the universe by creating a fresh new Decepticon army. Optimus said in the first film that Megatron and the Decepticons eliminated all innocent life on Cybertron, as well as those that opposed him. I'm sure that Megatron's goals aren't at all different to that of the Fallen.
I doubt their goals to dominate the universe changed in the second film.






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