At first glance, I would have agreed they look similar to the one in the link provided (found by my diggin' partner, Doug Hill by the way). But aren't these too small for canister shot?
I'm no expert, but didn't cleaner bullets have zinc/lead washers on them? Visisted Chickamauga yetsterday and they had one of the cleaners like that in their museum, but said it was missing its washer.