"Seems to apply here since going from single member LLC (disregarded from owner) to C corp."
See https://www.irs.gov/businesses/small-businesses-self-employed/do-you-need-a-new-ein
You will not be required to obtain a new EIN if any of the following statements are true.
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You report income tax as a branch or division of a corporation or other entity, and the LLC has no employees or excise tax liability.
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An existing partnership converts to an LLC classified as a partnership.
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The LLC name or location changes.
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An LLC that already has an EIN chooses to be taxed as a corporation or as an S corporation.
