Snapshots of the same version are not inter-compatible

Environment (Mainnet, test network, build from source, ...)

Versions v17.3 and v18.0-rc1 of octez-node, static binaries taken from tezos-packaging.

Summary

Snapshots produced with octez-node version v18.0-rc1 cannot be imported by version v17.3, despite the fact that both produce snapshots with snapshot version 5.

Expected behavior

The snapshots are inter-compatible when the snapshot version is the same.

Actual behavior

octez-node snapshot import version v17.3 fails with the message:

octez-node: Error:
              Pack_error: {"Unknown_major_pack_version":"00000005"}

Steps to reproduce

With version v18.0-rc1 and a node with context running on ghostnet, run:

octez-node snapshot export --rolling test.rolling
octez-node snapshot info ./test.rolling

the second command should report snapshot version 5.

With version v17.3 and a clean data directory then run:

octez-node config init --history-mode=rolling --network=ghostnet
octez-node snapshot import ./test.rolling

which results in the error above.

Note that running snapshot export and then snapshot info with v17.3 also reports a snapshot version 5.

History mode

I only tried with a rolling history on ghostnet.