Unfortunately, no. All devices linked to the same account will have the same channels installed. Remove a channel from one and it's removed from all. The only way to do what you want is to link it to a different Roku user account. There's no charge for that, but the account does need to use a different email address.
To link a device to a new account, you must perform a factory reset, and set it up again as a new device. There's no way to switch accounts and keep any existing channel settings.
Dan
Roku Community Streaming Expert
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