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I don'tknow if Washita are good for razor, perhaps; the Dragon Tongue are around 4-5 K in grit.

And yes, if have layer on side could be an Hindostan or a Canadian Magog oilstone.

The cream in color is an Arkansas Washita, the black one I don't know, could be a Dragon Tongue or a Welsh slate like Yellow Lake oilstone, but isn't easy to recognise from this pictures.