Sky and Research, different radical usage?

So how come 空 and 究 look like they use the same top radical, but 空 uses ‘helmet and legs’ combined, and 究 uses ‘hole’? Are they actually different radicals or is it just for memonic purposes?

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The tendency is toward reducing the total number of items per kanji when possible. So since hole wasn’t available as a radical in level 5, roughly the same shape can be achieved with less items in level 8, so they do that.

I guess.

Again, the radicals are being overhauled, so this could already be moot. We’ll find out eventually.


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