I don't understand the point of it. The only time a variation of a game should be listed, in my opinion, is when there's actually a difference in contents. I'm really not concerned if my Balloon Fight cart has 3 of 5 screws. I care even less that people who may view my collection here know how many screws are in it. I don't care if my label on Super Mario Bros. 2 has a round or oval Nintendo Seal of Quality.
I can kind of understand indicating whether or not it's a "Greatest Hits" type of variation, though. Collectors often prefer not to have those variations so they end up being worth less, even though in the long run it's just the same exact thing with a different color label. But I kinda get it.