The WE-SL has more pins and supports either two or four winding configurations. This can be used in applications like ISDN-Bus, measurement signal filtering as well as power supply systems lower than 80V_DC or 42V_AC. They can handle up to 5.6A of current. The WE-CNSW comes in 0805 and 1206 packages. These have high common mode suppression at high frequencies, into the Gigabit range. Typical currents are four tenths of an amp. Notice that the only part here using the manganese zinc material is the WE-SL. The rest of the parts utilize Nickel Zinc cores, supporting the higher frequency spectrum.