Yes, use whatever works best. For what it's worth what you bought was probably the 10% urea version. Few pharmacies even carry the 10%. The 20% removes the top layer of dead skin faster than the 10%. If someone does not have ichthyosis (skin growing too fast keeping body moisture and oils from reaching the outer layer) 20% would be too aggressive but 20% may be needed for ichthyosis. It is for me. If tried, try it on a small patch of your skin for a few weeks. I've only found Walgreens stocks the 20% in their warehouses. They special order it - takes a few days. But no prescription needed.
Gary from Kansas