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If you look at the progression in the numbers between 140<->160 and 160<->180 (dimensions A and C) they are not the same so short answer: no (about using 160<->180 adapter)
But because you are placing the caliper on a circle (the rotor) there is room for more than one correct way of doing it. So some diy trial and error maybe...
edit: But thinking it through your 160-180 adapter SHOULD work. It moves the caliper 1cm out and should be good for both situations.... ignore the above :)
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svenhöek
Following on from the above, is there any reason why simple parallel spacers would not work (see pic)? Obviously having them as a single unit will be better regarding vibration / noise but I guess it would work.
Quote from the guys blog, seems somewhat reasonable:
"when one searches for post mount adapters to increase the rotor diameter to 160mm on a fork designed for 140mm rotors, not much other than the suggestion to use regular pm160 to pm180 adapters turns up. pm160/180 adapters are available in all shapes, weights and colors. they generally have a width of about 15mm for the top bolt and about 10mm for the bottom caliper attachment point. it works for 140 to 160 as well, but due to the smaller radius of the 160mm rotor, it places the caliper quite far out on the rotor. i played around a little and discovered that keeping the caliper parallel, with a spacing of 10mm top and bottom, worked just as well. in fact, it brings the caliper closer to the rotor and as a result, there’s more brake pad surface clamping the rotor, which in theory should improve overall brake performance.
i spent a good amount of time searching every hidden corner of the world wide web and was almost ready to just make my own aluminum spacers. fortunately, i ultimately found just the right size at toronto cycles. ordered four pieces. it would have cost me a lot more to make a pair and have it anodized locally. with the growing number of disc-equipped cross, gravel and road bikes, better suited pm140/160 adapters would be a nice thing to find on the market."