Niko, I hardly ever see a Stihl so I don't know about their Brazilian cylinders. Wouldn't be surprised if they are also KS. Country of origin may not be on the actual part, but is nearly always on the packaging it comes in. So a Stihl cylinder in the box might tell us more than one in a saw.
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I wouldn't either, when the Brazilian Husky ones are.
However, there has been quite a few complaints on non-Mahle Stihl cylinders, and no referense to KS markings (or any brand marking but Stihl), so I am in doubt...
KS markings are subtle though, and you really need to know what to look for.