Day Watch 2006 Movie - Body Swaps

In the russian movie Day Watch (Dnevnoy dozor 2006), sequel to Night Watch, the main character Anton must hide from pursuers by forcibly having his body exchanged with a female coworker named Olga. Initially the two have the wrong vocal tonation, but Anton quickly learns from her how to correct this. They spend about 20 minutes reversed. At one point Anton joins a would be love interest in the shower, but unfortunately the film switches to the male character in a dress instead of keeping continuity (it probably has more to do with the woman seeing through to his inner-self.)