They're not the same at all, paintings exist to look good. If they're indistinguishable then they should be worth the same to people, that's all that matters is

They're not the same at all, paintings exist to look good. If they're indistinguishable then they should be worth the same to people, that's all that matters is what they look like, all they do is sit there and look good. Currency is a marker, the look itself is irrelevant, the only reason it has a distinct look is to prevent counterfeiting