They are a slightly different style of game. And what you can change on EU:Rome looks to be far more limited in scope as to what has happened in EB despite hardcoded limits.
A better option for you might be to go to an EU:Rome forum and discuss it with some modders there and see if they can get you the realism you want. They probably have the experience modding that game. Also, there are some mods already that aim to increase realism, although some increase pause pop-ups to an unmanageable amount.
Best of luck.
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