I thought they were one and the same?

From wiki:
* avoidance of most synthetic chemical inputs (e.g. fertilizer, pesticides, antibiotics, food additives, etc), genetically modified organisms, irradiation, and the use of sewage sludge;
* use of farmland that has been free from chemicals for a number of years (often, three or more);
* keeping detailed written production and sales records (audit trail);
* maintaining strict physical separation of organic products from non-certified products;
* undergoing periodic on-site inspections.