All I know is that there was a different (quinone) bleach and different developing agents. There were a series of process changes over the years, but the major changes took place at the time of the consent decree.

Until the early 60s, all color negative films but those made by Kodak used the Agfa method of interposing a wash after development to achieve some degree of edge and interimage effects. I still have one of the old kits around here I think. I have lots of negatives processed that way and still have some of the formulas here somewhere.