Rudraksha and Bhadraksha are same in the look. But Bhadraksha are light in weight and float in the water. Hold the bhadraksha beads in your right palm and close your hand. Did you feel any vibration. If not then it is Bhadraksha. Real Rudraksha gives that vibrating feelings like you are hearing heart beat. Bhadraksha are flatten whereas Rudraksha is bit pointed near the head.
Regards,
Bharati