could you post some pics of the ends so we can see them? The description to the 2 Large Square are the only 2 that sound like USB printer but unless i can see the ends I can't be of help for you.
I have no idea. I know that 2 of rhm have the small squarish ends like for cameras and smaller hook ups, 2 have the larger sqaurish ends like for printers and one is a regular usb cable.