Potassium 2-Ethyl hexanoate is an ingredient found in Dex-Cool but not listed on Dex-Compatible or yellow mixes with anything. The above example you listed is the formula for Dex-Cool. What brand of coolant did you read these ingredients from?
The only difference I can tell so far between yellow mixes with anything and Dex-Compatible are extra corrosion additives in the Dex-Compatible. To meet the GM spec for Dex-Cool, Prestone blends in these anti-corrosive additives. Thus making the dex-compatible coolant mixeable with original Dex-Cool and other Dex-Compatible coolants. What these additives are, I have no idea. Does it make the product unsafe for gaskets, radiators, water pumps etc.? I haven't had any problems at all, but I maintain my car very well.