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Picard
Almost, but not quite. In practice, most cassette sprockets, yeah even unto 6-speed, have been stamped from 2mm stock so they will accept 9/10/11-speed chain, but 5/6/7/8-speed chain has a roller width of 2.4mm and 9/10/11-speed has a roller width of 2.2mm, so it's possible for a sprocket to exist which accepts one but not the other.