There is no difference whatsoever between the two. "Amuse-bouche" is just a euphemism for "amuse-gueule" that some medias and restaurants find more politically correct. Indeed, "gueule", which is originally the name given to the mouth of animals, has recently (since at least a century or so) become a colloquial way to name a human face.
Genetic differences
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They are to many differences between them
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differences between people and cultures
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describe differences between northbridge and southbridge?