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c.5000K
That's not good nick, might look clean but I'd be surprised if it's not worn to the point it's worn the cassette too.
Generally you'll be fine going between cassettes on the same chain of you keep an eye on the wear (get a wear gauge), main problem will be that it's best to properly size the chain to the cassette which will mean it's too long on the cassette for the flat and derailleur b adjust screw will be out, it'll probably still work alright though.
snottyotter
Quick question please - if I get a second cassette for flat vs hilly rides do I need to get a second chain to use with it so they wear at the same rate? Current chain (and cassette) has c.5000K use but in good nick. Thanks!