help me see the difference

before spending any money on them, see if they will fit flush on your car and bolt up.
Of course we will check fitment. My junior wants to help with this small project for my Christmas. I've got a decent compumper (5 hp Sanborn) so we are looking at the handheld blasters with small hopper at Horrible Freight. I know I can use sand on common steel wheels but thought it would be smart to ask about these magnums.
Maybe there will be more input tomorrow morn. Thanks