Most Blatant Attempt To Confuse People:
They have replaced one word in the title and the cover is practically the same. In fact, 'killer' sounds more exciting than 'stranger' so you might be more tempted to choose this film over the other anyway.
Probably Wouldn't Happen In The Proper Film:
It’s essentially the same movie, but quite a lost nastier. One scene involves the killer torturing his young victims, slashing one of the girl’s breasts before throwing burning liquid on them, and forcing a guy to molest his girlfriend at knifepoint. It’s all pretty horrible stuff.