When you use the Tower map to check the stock for vendors, every item of the same type shows exactly the same upgrade path. I didn't check every single item, but it's consistent enough that I'm making the assumption it is universal. While this isn't terribly important, it is annoying when I try to check out what gear I may want in the future and plan out in game activities from my phone and the information I'm getting is unreliable. Also the Destiny wiki doesn't seem to have been updated since the Alpha, so out only option for comparing the Legendary gear available in the Tower is to run around in circles and trying to remember the stats and upgrades for every item you're interested in.