"It is important to regularly monitor the snapshot’s storage usage. If a snapshot reaches 100% of its allocated space, it will become invalid." [1]

ZFS snapshots use Copy-on-Write differently and have no such allocated space limit. Thus, we can do interesting things like snapshotting a file system after an OS is installed, and then roll back to that snapshot upon an OS upgrade failure, or even clone a new file system from that snapshot to have a different copy of the OS.

Essentially, the nature of the snapshots are different in both.

[1] https://docs.redhat.com/en/documentation/red_hat_enterprise_...