I know Alpro is for the service/medical industry - specifically non-skid soles, back straps, closed toes. All the Footprints I've seen look like regular shoes with Birkenstock insoles. Haven't seen any Tatami.
Thanks for nudging my memory - we have a vintage Birkenstock shoe store in town I need to go to. It's not used shoes, they are all new in the boxes, just from the 80's. A lady owned a Birkenstock store in the 80's and rather than having a going out of business sale, just packed everything up and stored it. About a year ago, a young man found out about it, made a business deal with her and opened a store with new "vintage" Birkenstocks. I think it's great that the boxes look the same, there are the same styles, same Birkis, Papillos, Birko-Flor.