Harder in a boring, un-fun, poorly thought-out way.
Since you said DOS EE tactician was challenging, while it was actually stupidly easy, I'm going to assume you are not very good at the game. Therefore, your opinion on DOS2 tactician difficulty doesn't really mean much. For people like you there is always explorer mode, while those who don't have problems beating the game do not have the option of increasing the difficulty.
