Ok, CD-3 and CD-4 are not interchangable. The dye hue shifts due to polarity and the activity differences will cause problems.

And, you cannot take a developer designed for Br/I emulsions and make it into a developer for Cl/Br emulsions. You must remove ingredients, but you can take a developer for Cl/Br emulsions and change it into one for Br/I emulsions by addition of ingredients.