Most of the confusion will be with pesticide labels and SDS conflicts. Oils, solvents, fuel, paint, etc. shouldn't be confusing.
OSHA (SDS worker safety) and EPA (pesticide Label containing some handler/applicator plus environmental and public safety impact) have not harmonized they're signal words and there can be conflicts between the SDS and pesticide labels. In attempt to harmonize the SDS for worker safety globally, the pesticide handling and environmental impact statements have become decoupled. This has impact in development of IPM programs and selection of lower impact pesticides.
Bottom line, there are more possibly confusing rules. It is important to follow all SDS and product label instructions. OSHA could care less about environmental impacts and they don't even require environmental impact sections on the SDS.
http://www.epa.gov/PR_Notices/pr2012-1.pdf"While EPA recognizes that this guidance may require users of the SDS prepared for pesticide products to become familiar with two different systems, at least until the agencies' requirements are harmonized, it is necessary as an interim measure to ensure that the differences do not cause confusion and to provide regulated industry with a clear pathway to compliance with both agencies' requirements."