I agree with EdAudit. If it's a whole different entity, the account would have to be closed and reopened with the correct information for the new entity. I would also require a new corporate resoution, Articles of Incorporation, etc.
It's not like changing a phone number or something simple. The EIN change is a big deal, to me, and I would definitely require new account and new signature cards, new disclosures, the whole nine yards.
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"Gratitude makes sense of our past, brings peace for today, and creates a vision for tomorrow." - Melody Beattie