Due to the absence of any plot details or character descriptions, an evaluation of the film's portrayal of LGBTQ+ characters and themes cannot be conducted. Therefore, the net impact is categorized as N/A, indicating no identifiable depiction based on the information provided.

Based on the provided information, there is no indication of transsexual characters or themes in the film {神秘夫人} ({movie}, {1966}). Therefore, an evaluation of its portrayal is not applicable.

The movie does not contain any action or adventure elements.

No source material, prior adaptations, or historical figures are provided for the film "{樓上樓下兩相親}" (1966). Without a pre-established canonical gender for any character, it is not possible to identify a gender swap according to the given definition.

This 1966 Hong Kong film is an original production. There is no prior source material or historical record establishing its fictional characters as a different race before their portrayal in this movie. Therefore, no race swap occurred.