Hi, i suggest to read this resource
Taking care about you should avoid SMR disk at all with zfs, IMHO don’t misc NVME with rust disk in the same pool.
Disks in the same raidz1 mustn’t bee the same, but the usable space/performance will reflect the spec of the smaller/slower disk.
Use a mirror pool with those 2 disks as storage, use the NVME for apps (in stripe, so ensure a good backup strategy)