31 and House of 1000 Corpses

First, 31 takes place in 1976, and HOTC takes place in 1977. Second, the character of Charly in 31 and the character of Baby Firefly in HOTC are both played by Sheri Moon Zombie and it is unclear at the end of 31 whether Charly dies or survives. Perhaps the character of Doom-Head spared Charly because he saw something in her and she became his acolyte and this explains how Baby Firefly got so screwed up.

First, 31 takes place in 1976, and HOTC takes place in 1977. Second, the character of Charly in 31 and the character of Baby Firefly in HOTC are both played by Sheri Moon Zombie and it is unclear at the end of 31 whether Charly dies or survives. Perhaps the character of Doom-Head spared Charly because he saw something in her and she became his acolyte and this explains how Baby Firefly got so screwed up.