ZFS ZFS use of altroot

Apologies for the simplicity of this question, but for some reason I find it confusing.

I have two zfs FreeBSD systems on two separate disks and need some of the files from the old disk.
Is the best way to import the old to the new using the altroot facility, and if so what is the syntax?
Is this correct?
zpool import -R /media oldzfs
which would mount oldzfs on /media and make the files available read/write?

Apologies again - but playing around with boot issues is not my forte.
Thanks
 
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