How to make percentage differences end up the same? So larger number changes are even with smaller number changes

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How to make percentage differences end up the same? So larger number changes are even with smaller number changes...examples:

(a) New Price: 126.953 Old Price: 126.83 Difference = 0.123 / 0.09%

(b) New Price: 26.953 Old Price: 26.83 Difference = 0.123 / 0.45%

Both of them have a difference of 0.12 but extremely difference percentage differences, how would I calculate it to be the same percentage difference?