Essays typically don't change and when they do, they change...a lot. But it's almost a guarantee for questions such as why MBA and why this school. Whether explicitly stated or insinuated, you'd have to discuss these two questions. So ya, it just may be good to start, BUT I would only do it as a good way to start gathering your thought, instead of thinking about finishing your application (otherwise, it's such a big discouragement should the prompts be different).
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