ZFS (ZoL). New VDEVs with larger disks: OK or not?

Can I sanity check something, please? - I have a single ZFS pool, containing multiple RAIDZ2 VDEVs, each of six disks - One of the SAS JBODs has empty bays in it - I'd like to expand the pool[1] by filling all the empty bays with disks - …and using the new disks to create new, additional (6-disk RAIDZ2) VDEVs i.e. like the existing VDEVs _However:_ The disks that are currently in the JBOD are **12TB**, and I'd like to fill the unused bays with **18TB** disks. I can't see any reason why this won't work, or why it might be a problem[2] . Am I missing anything? (I've read various things online, and I've been through the documentation; I *think* what I'm proposing is OK. But I'd be grateful for a second - or third, or fourth - opinion. I'm using ZFS on Linux zfs-0.8.3-1ubuntu12.18 on Ubuntu 20.04). Thanks for reading. ---