the EPA registration number is for the solution and is registered by the manufacturer after testing. If the product, even with a different "vendor" uses that registration number, then it is supposed to be the same stuff and is just a re-branding of the solution from the manufacturer.
Here are the guidelines -
List N: Disinfectants for Use Against SARS-CoV-2 (COVID-19)
View List N's information in our new tool
List N Web App tool
All products on this list meet EPA’s criteria for use against SARS-CoV-2, the virus that causes COVID-19.
Finding a Product
To find a product, enter the first two sets of its EPA registration number into the search bar below. You can find this number by looking for the EPA Reg. No. on the product label.
For example, if EPA Reg. No. 12345-12 is on List N, you can buy EPA Reg. No. 12345-12-2567 and know you’re getting an equivalent product.