This needs some investigation. Discuss ideas and findings on the talk page. Specifically:
Unused content, if there is any.
More regional and revisional version differences, if there are any.
"The fight's just begun! We need your help!"
Combining the classic 2D-fighting gameplay that the series is known for, with 3-vs-3 team battles and a handful of action-RPG elements, Street Fighter: Duel has more fighters than any other spin-off game in the series: a total of more than 101 of them (44 of which coming back from Street Fighter IV and it's Super and Ultra updates), compiles classic locations and stages from both the IV and V eras of the series (while also adding in brand-new ones), and features an original extensive storyline.
After the Capcom logo, the Chinese version has the animated TOPJOY and Tencent Games logos. The English version, only just has an animated Crunchyroll Games logo.
While the Chinese version of the game uses its own unique artwork on the download screen, the English version re-uses the animated background from the title screen.
The App Icon is different for each revision of the Chinese version of the game. Version 1.0.10 had an icon with Ryu, Version 1.0.22 had an icon with the game's Chinese logo, Version 1.6.301 had an icon with Chun-Li, and Version 1.7.000 has another Ryu icon.
Like the Chinese version, each revision of the English release of the game has a different App Icon. Version 1.1.2 used an icon with Ryu, Version 1.1.5 uses an icon with Gore Magala Ken for the game's Monster Hunter crossover event, Version 1.1.9 uses an icon with Dante for the first Devil May Cry 5 crossover event, Version 1.2.1 uses an icon with Vergil and Nero for the second Devil May Cry 5 crossover event and Version 1.2.3 uses an icon with Chun-Li.