I not work with CD 4. I thing those is not dramatic changes by replacing CD 4 with CD 3 in color negative processing.
I use for all photo color negative films ECN II process (without prebath). The results are always good. Even with expired film. http://www.apug.org/forums/members/g...421-catei.html
For me it is easier to use ECN II process for color negatives - photos.
For color slides, I use the CD 2 in color developer. Not CD 3 color developer. http://www.apug.org/forums/members/g...422-scala.html