DD can be used to clone MBR sectors, or an ESP. Alternatively you could just clone the entire drive to save yourself the trouble of making multiple images.
Insert your USB drive (or SD card) into your computer, open ImageUSB, and select the drive you want to create an image of. Select the Create image from USB ...
ImageUSB is a free utility which lets you write an image concurrently to multiple USB Flash Drives. Capable of creating exact bit-level copies of USB Flash ...