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If you want it in the same scale, no difference. If you want to scale it proportionally to the new paper size: A size papers are related dimensionally by precisely a factor of two, but the way scale works is logarithmic so the largest you could print on A3 would not be 1:175 but about 1:250, or 140% of original size.
EDIT: I see Lawrence replied at exactly the same moment with a more precise calculation, but I'm pleased that my quick estimation was pretty close!
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