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The norton flattening stone is very soft, and only suitable for norton waterstones.
If you'd use in on your swaty, you'd destroy the flatness of the norton flattening stone and round the swaty....

The grit ratings don't compare that well, because coticule grit are round, whereas sapton and norton ceramic grit is sharp and pointy.
So 8K ceramic grit is much more aggressive than 8K coticule...

I only have the coticule, but I understood that the shaptons are quite expensive.
Small coticules are pretty cheap on www.theperfectedge.com
If price is a point, then a coticule is the way to go.