Where the two Voltarens differ is in how the diclofenac is included in each formulation. Voltaren Emulgel contains diclofenac diethylamine 1.16% while Voltaren Gel contains diclofenac sodium 1%. Diethylamine and sodium are salts that are attached to the diclofenac molecule, which aid in its absorption.ustomers frequently ask us if the Voltaren Gel 1% found in the USA is the same as the Voltaren Emulgel 1.16% marketed in Canada and many other countries around the world.