I dug out the chart. First row is spoke gauge, First column is spoke count. A 36H wheel built with 2.3 mm gauge is set as 100% cross section, then the rest are calculated as percentages of that.

--------1.5-------1.8------2.0------2.3
18-------21-------31-------38------50
20-------24-------34-------42------56
24-------28-------41-------50------67
28-------33-------48-------59------78
32-------38-------54-------67------89
36-------43-------61-------76-----100

Blissfully ignoring things like differences in build quality, spoke quality, hub configuration and rim influences, this is a decent starting point for comparing different build options to each other. A 24H using 2.0 mm spokes is 50% of max "strength" while a 32H using 1.8 mm spokes is 54% of max "strength".
24H and 2.3 mm spokes should yield a wheel that's stronger than a 32H using 1.8 mm spokes, and a dead match for 32H@2.0 mm gauge.

As I can get them, I'd probably build brake side 2.3 mm and non-brake side 2.0 mm for 24H. It'd give me a wheel with about the same(lowest)lateral rigidity as a 32H@1.8 mm, and a decent spoke tension balance.

(And yes, I know tension isn't the correct engineering term in this case. But in this setting, the meaning should be clear enough)