Your theory about "confused" is an interesting one. Typically, the printer profiles ("Choose printer") feature exactly one of each type. Although it's certainly not unreasonable to have several printers of the precise make and model, it does NOT strain credulity to think that an off-the-shelf application could readily become confused by "Brand X, Model Y, #1" and "Brand X, Model Y, #2".
THAT HAVING BEEN SAID, if you have TWO printers of the same make and model, they should BOTH have been INDIVIDUALLY installed, and they both have different MAC addresses, so they should show up as TWO items in the "choose printers" dialogue in whichever application you're printing from. If you did NOT specifically install the second such printer and just relied upon "It's the same one," you are at least partially responsible for mixing up your computer, which only has limited intellect, anyway. (Actually, it has NO intellect.)