List of regional version differences (SSB)
There are many differences between the Japanese and North American releases of Super Smash Bros., which are listed on this page. The regional differences are much more significant than in Melee or Brawl, often resulting in considerable differences in matchups between characters.
NTSC-J to NTSC-U changes
NTSC-U to PAL (AUS) changes
PAL (AUS) to PAL (EUR) changes