Are Oxo-Degradable and Oxo-Biodegradable Bags are different?

No both are Degradable Plastics only and Not biodegradable. Currently available all Oxo-Biodegradable bags in the market should be called as Oxo-Degradable only. ASTM D6954 is the standard guide developed for testing plastics that degrade by a combination of Oxidation followed by Biodegradation. Unfortunately none of the suppliers could prove the biodegradation after oxidation.