I arranged the sheet. I'll answer this one.
Yume Kojo: Doki Doki Panic and Super Mario Bros. 2 are not, in fact, the same exact game. Japan got a release of both of the games, with the latter titled Super Mario USA. There's many differences between Doki Doki Panic and Mario 2, even if the former began development as a Super Mario game in the first place. At the moment, it's titled Doki Doki Panic to be easily recognized by site-goers; Dream Factory: Heart-Pounding Panic may be the translated name, but it's not an official one.
TL;DR - Yume Kojo: Doki Doki Panic is not the Japanese version of Super Mario Bros. 2, it is a separate game entirely, so we listed it as one.