replacing disk from mirrored root ZFS-Pool

yes, the process is the same. if the disk you want to replace has not failed yet, I would not take it offline though, especially in a two disk mirror (because once you take one disk offline, you don't have redundancy anymore!). you can simply replace it (then you temporarily have a three-disk mirror, until the replace operation is done). if you are not sure, it is always a good idea to simulate such operations using a VM ;)
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