The pose of the horse's legs in statues of rulers is dictated by some clear principles, so they may not be very useful as comparison material.
If the ruler died in battle: horse rests on two feet and has two feet in the air.
If the ruler died as a consequence of injuries from battle: horse has three feet on the ground and one raised. This is probably the most common, and is seen in both examples.
If the ruler died in bed (old age/sickness): horse has four feet planted on the ground.
If the ruler died in battle: horse rests on two feet and has two feet in the air.
If the ruler died as a consequence of injuries from battle: horse has three feet on the ground and one raised. This is probably the most common, and is seen in both examples.
If the ruler died in bed (old age/sickness): horse has four feet planted on the ground.

