Can BTRFS snapshots on OpenSUSE Tumbleweed (btrfs+snapper) provide same functionality as ZFS Boot Environments?

Nope.

Cite from System Recovery and Snapshot Management with Snapper for OpenSUSE Linux.

● Limitations

A complete system rollback, restoring the complete system to the identical state as it was in when a snapshot was taken, is not possible.

With ZFS Boot Environments you are bulletproof.

With btrfs+snapper you are crossing fingers if it will work the way you need.

Not the same thing.