They could be, or they could not be, I really have no idea. The master branch is simply the main branch, but there can still be other, newer builds in other branches. From what I can see, some branch called "cardgame" has the most commits past master branch, but that doesn't necessarily mean it has that much more content. It probably does, but I'd have to actually look at the commits to do that, and I'm just too lazy. Master is most likely the most stable, so I'd use that. Using anything else could make you run into a fuckload of bugs and unfinished content. If you're asking if you have to download each item in the master branch individually, the answer is no, you do not. Hit the green "clone or download" button on the right and then "download zip."