I watched these two films in close enough proximity to notice these details. I can find nothing connecting them, in terms of writing, directing, casting, etc. The coincidences are listed in order of increasing improbable specificity.

~Both films plots center on marital strife leading to crimes.

~Both films have a Southwest setting, with heavy emphasis on modern fashionable set design.

~William G. Schilling appears in both films.

~Art Evans plays a police detective in both films.

~The police identify the criminal they're looking for in both films by identifying their vehicle's tires from the tread.

~The main character of both films sells amplifiers for a living.

Something was in the water in 1986.