What is the law regarding same/similar employment under the EB2 category?

Question Details: I filed I-485 in 2012 under EB-2 category and received EAD. I'm planning to switch employers an wanted to get clarification on same/similar job category for switching employers. Will the same industry would suffice USCIS needs or it has to be same job category? For example, if I work in a university and switch to a university would be acceptable for any position or if I work in customer interactions in a company I can work in any industry that has a job that focuses on customer interaction?

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