There were two PC floppy versions - 16 colour and 256 colour. The 16 colour version had fallbacks for CGA and Hercules, the 256 colour version had a fallback for EGA. So the CGA screenshot is the 16 colour version running with CGA fallback, and this is also why there's a set of "256 colour EGA" shots. It's a little confusing, but it's correct.