The channels/apps you've installed are tied to your Roku account, so as long as you link the new device to the same Roku account they will be automatically installed. In addition, if you subscribe to any service using "Roku pay" then the subscription will be available automatically without the need to log in. If you subscribe to any service directly then you will probably have to log in or otherwise enter your credentials on the new device. Some services participate in Roku's "single sign on" and don't require entering your credentials again, but I couldn't say which ones.
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