In the second case the location/context where you use RedButton would not need to be aware of the difference between a Button and a RedButton, so you'd be able to use a RedButton anywhere where you'd otherwise be able to use a Button (-> conforms to LSP there, I would think).
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In the second case the location/context where you use RedButton would not need to be aware of the difference between a Button and a RedButton, so you'd be able to use a RedButton anywhere where you'd otherwise be able to use a Button (-> conforms to LSP there, I would think).