Dreamcatcher
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It's easy to see what changes and what doesn't by simply loading a random map in the editor.
What doesn't change: terrain and objects, the number and type of monsters, the contents of Pandora's boxes.
What does change: all artifacts (while preserving their level), the type of some resources, and for strictly defined resources, their quantity; the contents of all banks, dwellings, and universities; the guards of neutral towns; the skill progression and army size of prisoners.
Added after 13 minutes
[/U]Regarding restarts, I would recommend designating one person as the lead, who would generate the saves, check them for obvious glitches, blocks, and generally strong imbalances in one direction or another. This saves time and reduces the number of draws.
The idea is good, but again, we will face the possible lack of time for the judge generating the saves, which will delay the players. So, scheduled games are difficult to play on time...