What are the similarities and differences in material between cloth rolls and sandpaper?

Similarities
Basic composition: Both abrasive rolls and sandpaper are based on some kind of substrate, and they have abrasive particles stuck on them. These abrasive particles are usually hard materials used for grinding, polishing or cleaning.
Types of abrasives: They might use the same kinds of abrasives, like emery, corundum, silicon carbide and so on. These abrasives are widely used in all kinds of grinding and polishing jobs because of their hardness, wear resistance and cutting ability.
Similarity in use: Both abrasive rolls and sandpaper can be used to deal with the surfaces of materials like metal, wood, plastic and so on. For example, they can get rid of surface flaws, make the surfaces smooth or make them shinier.

Differences
Difference in substrate: The substrate of abrasive rolls is usually fabric. This fabric might be made of materials like cotton, linen or synthetic fibers. It's soft and flexible, which makes it easy to work on surfaces of all shapes. The substrate of sandpaper is usually paper. This paper might be specially treated to make it stronger and more wear-resistant. But compared to fabric, it might be more brittle and less flexible.
Difference in structure: Abrasive rolls usually have abrasive particles evenly stuck on the fabric surface to form a continuous grinding layer. This structure makes abrasive rolls keep a stable grinding effect during the grinding process. Sandpaper might have different structures. For instance, the abrasive particles might be embedded in the paper fibers or form specific grinding textures. This structure makes sandpaper give different grinding effects during the grinding process, like coarse grinding, medium grinding or fine grinding.
Difference in durability: Because of the differences in substrate and structure, abrasive rolls and sandpaper might also be different in durability. Generally speaking, abrasive rolls might have better flexibility and durability because they use fabric as the substrate. They can stand more grinding pressure and be used for a longer time. But sandpaper might be more likely to get damaged or worn out because the paper substrate is brittle, especially when doing heavy-duty grinding jobs.
Difference in where they're used: Abrasive rolls and sandpaper might also be different in where they're suitable to be used. For example, abrasive rolls might be better for places where you need a soft and flexible grinding tool, like grinding curved or irregular surfaces. But sandpaper might be better for grinding flat or regular surfaces.