The 1299 headlight has a mount for the IMU. The 1199 headlight does not. You would have to find a way to mount the IMU in the same position as stock (not easy to do). If the IMU isn't mounted at the right angle, it's not going to function properly.
FYI, that wiring diagram is the same. That's what I used for my conversion.
Guys,
the entire shape of the 1299 headlight (LED an non LED) is different (basically wider) than the ones of 1199. So any 1199 headlight won't fit into the 1299 front fearing.