Warm spare backup question

I was always under the assumption that a backup taken from machine A could only be restored to machine A or another machine with a matching deployment id. As I read the warm spare backup guide it appears you can take a backup from A and restore it to B even with the deployment ids being different. Was my initial assumption wrong?

http://wiki.freepbx.org/display/FPG/warm+spare+setup

Yes. You can restore to any system with matching FreePBX version.

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Holy F. With regards to FreePBX version is this the 13.17 and 13.19 or the version of the core module?

Hi Mark:

Generally you want your FreePBX versions to be as close as possible, so it is best to run module updates on both pbxs prior to the backup and restore. If that is not possible, then as long as major versions match, you should get a working restore but may have to run module updates afterwards.