According to MacPherson, “You can deadlift in squat shoes, but it isn't advised. If you are performing deadlifts far from your maximum effort, it should be OK.
“Ideally, you'll deadlift in shoes that are flatter and wide enough to allow you to spread out your toes to grip the ground and create a tripod foot position, which helps you create a good base with your feet. This is true for squatting as well, but some people benefit from the slight heel lift in squat shoes. Deadlifting doesn't require or benefit from a heel lift.”