I have been eyeing Medieval Kingdom Wars and Kingdom Wars 4 and am wondering what the differences between these two games are?

I have captured Athens and Cairo, but I didn't get the steam achievements. I haven't used any cheats and steam achievements are not disabled for my game/playthrough.

Is there any point in trying to damage enemy buildings? I can get a building down to 1 HP but the building doesn't actually demolish, so does it make any difference? I had a siege battle where I got the enemy manor down to 1 HP and I thought I would win the battle but I still lost...

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I really like the content in the Royal Blood dlc from Medieval Kingdom Wars and was wondering if there were any plans to add similar content to this game. Playing as the king from the start of the campaign and such.