What type of entity were you? what type of entity are you now?
This is not as simple as you may perceive it. What did your business change from? What did it change to?
For example, if you changed from a single member LLC to a multi-member LLC, you will be filing a final SCH C for the single member LLC showing the closure/disposition of that single owner business. Then you will file a completely and physically separate 1065 partnership return showing the acquisition/creation of a completely new business that is a multi-member LLC with two or more owners.
Sorry, I guess that is important. I had an EIN when we first started business as just a DBA, then after creating an LLC I applied for a new EIN.
So DBA to LLC
Neither DBA or LLC is a recognized tax entity. See <a rel="nofollow" target="_blank" href="https://www.irs.gov/businesses/small-businesses-self-employed/business-structures">https://www.irs.gov/businesses/small-businesses-self-employed/business-structures</a>
The only difference between a DBA, which is a sole proprietorship, and a single member LLC for tax purposes, is the spelling. That's it. Both are considered a disregarded entity for tax purposes. Your business structure did not change one iota, while at the state level the business "type" may have. You had no need to apply for a new EIN. I recommend you not even use the new EIN.
If you use the new EIN then you have to close the old business with the old EIN, and open a completely new business with the new EIN. That means you'll be filing two SCH C's for the tax year, and just creating a bunch of unnecessary work on your part.
I suggest you ignore the new EIN and file one SCH C with the old EIN and press on with life. It doesn't matter that the name of the business may have changed either. File the SCH C with the most current business name under the old EIN and be done with it.
There could be an issue if someone sends the OP a 1099-MISC with the new EIN.