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The only real difference I see is the clock speed, and the Max TDP (wattage requirements), but other than that, both processors have the exact same features.
For your first question the answer is no, you will have the same number of system hosted.
Regarding the 2nd question, the bus ratio will allow the processor to have a faster clock speed, in this case the Intel® Core™ i7-3920XM will be 0.2 GHz faster.
Thank you !