freePBX Backup compatibility with different versions

Dear All,
I have one freePBX primary server in my campus on 13.0.191.11 version and one secondary server on 13.0.120 version.
I want to know that whether full backup taken on primary server will be compatible with the secondary server in case of primary failure?
OR do I need to keep both the servers on same version of software?
Please guide.

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