Then go ahead and ignore my advice!
E6 color developer contains ethylene diamine, which is a silver halide solvent! It also contains citrazinic acid which is a "colorless" coupler. It actually forms a soluable cyan dye which washes out of the film. Either of these will affect color negative development adversely.
There are other ingredients that interfere with negative color development but assist reversal color development, but I think I have made my point.
Oh, the pH of the ECN color developer is about 10.x whereas the E6 color developer is abou 11.x. I forget the actual decimal values but the first two digits should give you a small hint.