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Hmm .. there's a lot more to this than meets the eye.
The fundamental difference between the two is 'background independence' or 'universality' which in turn, stems from a philosophical difference. There has been heaps written on this and the philosophical debate still rages.
Quantum Gravity has been attempting to unite it all for years .. unsuccessfully. String theory comes closest.
Don't ask me to distinguish the philosophical differences though … deep stuff.
Cheers
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