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The sight at full extension is, say 36" away from your eye. Move it in one hole and it will be 35" away. That's about 3% closer(roughly,I know)
With such small angles I would expect the sight marks to match that quite well so they would be 3% closer on the scale.
Let's say your 20y sight mark and your 80y sight mark are 5" apart, now. With one hole closer they would be 3% closer. 4.85" apart. The sight will be raised by 1 1/2 tenths.
Do that on a metric sight scale. Same space between 20y and 80y would be about 12c.m. 3% closer would be almost 4mm.closer.
So 3 holes closer might be worth 1c.m. rise in sight mark. The 90m or 100y would be roughly 25mm below the current 80y mark.
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