I grew up in Ohio around a similar sect as the Amish -- the Dunkard Brethren. They had a horse and buggy church and a car church but one thing they had in common was the latest farm equipment. The horse and buggy church kids used to go on dates on the modern tractor into town. They always referred to themselves as the car church and horse and buggy church and I don't know the real name of either church to this day.
They dressed the same as the Amish so I don't know the difference except they were pacifist and wouldn't lift a firearm to protect their own but would go hunting.
Which is why you will see Amish mainting their front yards with reel mowers and gas-powered weed-whackers - first time I saw that was in Bart Township, where this horrible event occurred.
Their people (for the most part) had originally came from Uniontown Pennsylvania, and those folks there originally came from Lancaster and York counties in Pennsylvania, mostly Paradise township.
Uniontown was a non-Amish area settled predominantly by First Borners, Dunkards and other Plain Church people.
I know that when I read the names of the children who were murdered that I will recognize surnames. Trying to keep that part repressed at the moment.