The Cie94 calculation requires an Application type to be specified. This value, "Graphic Arts" and "Textiles" determines which set of constants get used during the calculation.
Supported color spaces include Rgb, Cmy, Cmyk, Hsl, Xyz, CIE-L*ab, CIE-Lch, and Yxy.More information on sRgb vs AdobeRgb.
Cie94 is targetted specially at the paint and coatings industry. It includes a commercial factor that weights the forumla different for Graphic Arts and Textiles applications.
It's similar to Cie76, except that it's based around the Lch color space and the aforementioned commercial factor.
Delta-E calculations performed using the open source ColorMine library.