I've been reading about final goods and commodities and some links
https://en.wikipedia.org/wiki/Final_good
https://marketbusinessnews.com/financial-glossary/final-good/
mention that final goods are commodities. However, that is contradictory with commodities' property of substantial fungibility, which is "the market treats instances of the good as equivalent or nearly so with no regard to who produced them". What am I missing here?