Because of the difference in thickness, one piece is 2 cm higher... One piece is higher than the other...
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messier42What about this? do they sound natural? 'raised spot' ,'discrepancy','protruding spot','elevated spot'Yes. The bare "discrepancy", not so much.
messier42What about 'there is a step-up'? Can this be used for the pieces of wood that i described? The piece of wood steps up in height.It's possible, I guess. What words I would use would depend on the exact situation.