The general difference with organic pesticides and herbicides is they tend to be less persistent in the environment (lower half life, less off-target impact, etc). Organic farming was never supposed to be about human health, it was supposed to be about environmental health. The program was also suppose dto use chemicals as a last resort, instead relying on different agricultural techniques from the typical mass monoculture farm. Instead it has been mostly hijacked by people just doing the paperwork and switching which chemicals they're spraying.