Majestic 2 = DK? I don't see it really.
Majestic 1 is the exact opposite of Dungeon Keeper in setting, it's almost exactly the same concept in gameplay though.
In Majestic you build structures to lure heroes of different type and indirectly control them through their environment to get them to fight monsters that are coming from the dungeons. The heroes level up and go about their business based on their hero type.
In Dungeon Keeper you build rooms to lure monsters of different type and indirectly control them through their environment to get them to fight heroes that are coming in to your dungeons. The monsters level up and go about their business based on their monster type.
In Majestic you would often be against another Kingdom, in DK you would often be against another Dungeon.