I would think manufacturing would be similar. Why have a second manufacturing set up to deliberately get a lower quality product and thus less profit?... maybe a bifurcation in the process where the product is combined with other substances to make a different product.
Obviously, there are stricter quality control mechanisms for pharmaceuticals. The differences between GHK-CU pharmaceutical (99.99% purity) and GHK-CU cosmetic grade (>70% purity) is in the fillers.
And, anyway... Technically .... anything less than 99.99 purity is cosmetic grade.