Is the measurement 0.2mm the same as 0.2um?

No, 0.2 mm (millimeters) is not the same as 0.2 µm (micrometers). In fact, 0.2 mm is equal to 200 µm, as 1 millimeter is equal to 1,000 micrometers. Therefore, 0.2 mm is significantly larger than 0.2 µm.