This is from IRS:     Here is link for you to research: 

https://www.irs.gov/businesses/small-businesses-self-employed/do-you-need-a-new-ein

Partnerships

You will be required to obtain a new EIN if any of the following statements are true.

• You incorporate.
• Your partnership is taken over by one of the partners and is operated as a sole proprietorship.
• You end an old partnership and begin a new one.