Can someone explain; will it be considered as 2 different manufacturer if it is manufactured by 2 different entities producing same products?

The registration of the company name, is the company registered considered as one manufacturer? Or is it plants specific?

Materials & Resources - Building Product Disclosure & Optimization for Environmental Product Declarations (EPDs) – Verified  EPDs are  worth 1.5 products versus the requirement to have 20 total products from 5 different manufacturers in Option 1.