1. Lead core hardness is different. The lead core of oil-based color lead is relatively hard, while the lead core of water-soluble color lead is softer.

2. The properties are different. The refills of oil-based color pencils are waxy, so they are insoluble in water. After painting with water-based color pencils, you can use a brush to lightly dip the paint in water to dissolve the paint.

3. The effect presented is different. The color saturation of oil-based color pencils is relatively high, and the color is relatively bright, which is suitable for detailed painting such as hyper-realism. The color of water-soluble color lead is relatively light and elegant, and has the characteristics of being soluble in water, which is suitable for large-scale coloring.

4. The requirements for drawing paper are different. Oil-based color pencils generally use fine-grained sketching paper; however, water-soluble color pencils have special requirements on the number of grams, weight, and thickness of the paper, and they must withstand the addition of water without wrinkling.