Your channel selections are attached to your Roku account. Any additional or replacement Roku linked to that same Roku account will get all those same channels downloaded to it.
Some of those channels may use Roku's "One Login" (I think that's its name) capability to log you into new copies of the channel, but many do not, requiring you to log into the new installations manually at first.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X