> Cga seems to be 1-to-1 conversion of ega

I'm not sure. The dithering is obviously different, not only harsher but in different places in many scenes. Also, the splash screen doesn't have scrolling clouds in the CGA version. And there are other subtle changes.

Call me weird but there's a certain charm to the CGA version, though it's obviously the worst of them. My favorite is the EGA version.