Fresh ginger is rich in 6-gingerol.

Drying converts gingerols to shogaols. 6-Shogaol is 2-3x more potent than 6-gingerol for anti-inflammatory activity and activates TRPV1 (pain receptor).

This means dried ginger extract is pharmacologically different from fresh ginger extract. Although the processing method creates a different medicine, most product labels don't distinguish between the two.

Publications of interest:

https://pubmed.ncbi.nlm.nih.gov/29976903/, https://pmc.ncbi.nlm.nih.gov/articles/PMC6692589/, https://pubmed.ncbi.nlm.nih.gov/19833188/