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To avoid such nonsense, you can simply discuss it in a small group and agree on common rules – why make things difficult?
1. Restarts. There are no restarts on HotA based on the 1-1-6 encounter, but there are on HotV.
2. Heroes. There are differences regarding the use of spells obtained from level 4 specialist heroes. There's no point in detailing it; just look closely. But pay attention: on HotA, Tant is limited, as are the level 4 specialists, but not on HotV.
3. Scrolls. On HotV, the requirements for building magic that allows the use of scrolls are more flexible, but there is no rule for the 6th week. On HotA, there is.
4. Necropolis. On HotA, the starting hero is random; goodbye, Gosha.
5. Diplomacy. On HotA, it is completely prohibited, but on HotV, it is allowed to a limited extent.
When creating the rules, I suggest using the following criteria – balance, freedom of strategies, simplicity, and clarity – in descending order of importance. Based on this and some experience, here are the default rules (of course, you can change them by agreement):
1. Remove the 116 restart – use scouting from the first days.
2. Do not limit Tant and Loins – I'm not sure about Tant; I don't have much experience.
3. Rarely applicable – I have never built 2 level 3 castles to use a scroll. Therefore, based on simplicity, introduce the 6-week rule.
4. Goodbye, Gosha, from the start – there will be fewer complaints about Necropolis.
5. Allow it to a limited extent – otherwise, I won't be able to refuse navigation, for example. Besides, there is an option – to level up a weak hero who carries troops – why cut off that possibility?