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In general, yes, Coticules are considered harder than Thuringians.

Both are hard stones, but I've had (and heard of) more Thuringians that form their own slurry than Coticules. This is kind of...

None of the thuringians that I have (seven or so... and counting...) load up at all. In general, a waterstones surface is refreshed by the sharpening action which forms a slurry, so there is almost...

I consider a stone that has just filled up with swarf to be "loaded", and an old stone with years of swarf/oil/oxidation to be glazed.

But I won't argue those points, I don't use enough stones...