As FSK said, we don't really like new threads that much here. If you have lurked these boards at all you should've seen that by now. Do read our stickies,
specially our rules and
our index thread. You'll find there that we have a Q&A and a a thread for customs which could have housed this.
However, I agree with FSK that this info is important and thus woukd/could warrant a thread of its own. So, I'll let it pass, but alas, I cannot speak for my brothers. Suit up and good luck.
Now, about the OP topic. I remember having read that apparently the last 3ds patch made the basic game match the Wii U version. That is, character speeds and neutral properties, but that Nintendo hadn't paid attention to the customs and so there are still some differences. This is, of course, annoying but considering that customs are still not tourney legal most people haven't noticed it (I haven't for example). Considering that Sakurai has said that they won't patch for balance anymore this could be fixed just as well as it could just stay like this for good. Right now, it's a who knows.
That being said. Stop Lurking, read the stickies, follow the rules, stop by social, just to maintain the tradition:
Welcome to the Link Boards, scrub.