The difference of offline play in Heroes II and Heroes III.

Now, let's talk about units. While I'm gathering information about useful offline units in Heroes III, what else can we remember about similar units in Heroes II (besides Djinns)?

1) It's worth noting the Vampire Lords. In the older version, they are significantly stronger because they regenerate from practically everything that moves. In Heroes III, they became more selective.
2) In the second game, there are monsters that will never join you under any circumstances – these are Elementals and Ghosts. The diplomacy process itself is also different. In Heroes II, you could recruit all units if you had enough money. In Heroes III, this is not always the case, and you know the reason.
3) In Heroes II, not all monsters can be upgraded. In the Barbarian castle, there are 3 such units; for the Knight, there is 1; for the Mages, there are 3; for the Necromancers, there are 4; for the Sorceress, there are 3; and for the Necromancers, there are 2. But there is also an exception – Dragons have a double upgrade, which is not observed in the classic Heroes III.
4) In the second game, there are places where, despite the generated save, you can find a random artifact. These are Demon Caves, Graveyards, and Abandoned Ships (which is why there are prohibitions and restrictions for offline play). In Heroes III, everything is more transparent. :)
5) In Heroes II, not all units can be recruited in external dwellings. Primarily, these are units of levels 1 and 2, with the exception of Borows, Gargoyles, and Zombies. They are recruited for free (except for the Wood Elf dwelling, where Dryads, unlike the Wood Elves, are purchased). For money, you can recruit neutral creatures. And you can also buy Trolls, Liches, and Dragons after fighting their guards.
6) In Heroes II, there are no Pandora's Boxes. But there is also a building that is missing in Heroes III – this is the Sphinx.