Short answers, pulled from the story.
Capcom Classics Collection emerged from a collaboration between Capcom, Backbone Entertainment, Sensory Sweep, and Klein Computer Entertainment. The initial PlayStation 2 and Xbox versions arrived in the mid-2000s as digital archives of arcade history.
A second volume followed on the 14th of November 2006 for North America only. Japan never received Volume 2 or the Xbox version of the first collection.
Remixed contained most remaining games from home console volumes one and two while Reloaded included sixteen games plus Knights of the Round, Eco Fighters, and The King of Dragons. Super Street Fighter II Turbo, Tiger Road, and Trojan did not appear in either portable release.
The first volume contained sixteen games drawn from previous compilations plus six new emulated titles. These selections included all entries from the 1998 Capcom Generations series and Street Fighter Collection 2.
Japan never received the second volume of Capcom Classics Collection despite its North American launch date. This regional split created distinct library experiences depending on where consumers purchased their copies.