Many people use chalk pastels and soft pastels interchangeably. However, they are different. Chalk pastels are chalk-based mediums that have chalky filler added to the pigment. They are durable, harder, and a good fit for kids’ projects. On the other hand, soft pastels are not that hard. It is easier to blend than chalk pastels but harder to remove. Chalk pastels wash away easily, whereas soft pastels might take a long time. Though with exposure to rain, strong cleaning, and weather, it goes away too.