First we started with water oil and milk.

Then we mixed the blue food coloring with the water

Then we mixed Half of the colored water with the milk.

Then we mixed the other half of the colored water with the oil

The difference between the mixture of oil and water and the mixture of milk and water is that the oil and water did not mix and the milk and water did.They are the same because they are both liquids and both have mixed with the water.

The oil and water mixture behaves differently from the milk and water because the oil and water don't mix.