The terms "paint pens" and "paint markers" are often used interchangeably to describe a type of pen or marker that dispenses paint instead of ink. However, there is no significant difference between them.
Both paint pens and paint markers are designed to allow users to draw or write with paint in a way that is similar to using a regular pen or marker. They come in a variety of sizes and colors and can be used on a range of surfaces, such as paper, canvas, wood, glass, and plastic.
In some cases, manufacturers may use one term or the other to describe their product, but the functionality and use are essentially the same. So, whether you are looking for paint pens or paint markers, you should be able to find a suitable product that fits your needs.