"Manga" is a style of Japanese comics. All three manga series were originally released only in Japan, are all part of Capcom's main universe, and act as tie-in products to certain console games to promote them before release.
Manhua are Chinese comics. Five separate manhua series were officially licensed, split between two studios: King's Foundation and Tinhagse. All manhua have only been released in China and although are adaptations of specific games, heavily deviate from the original story lines.