Yes, this is what I read. But I also read that it depends on the spring rating and they should be matched. I don't remember where, otherwise I would be posting the links. My experience is with a W111 Chassis. I wanted it to handle better and I was considering adjustable konis. But then I was not really able to find the konis characteristics, the spring characteristics and the relation to match them. I was also reading that people had better experieces with stock bilsteins than with konis on the W111 chassis. I then looked at the table of correspondence in the Workshop manual and discovered that for the W111 Chassis bilsteins with one green bar were recommended for normal use and with two green bars for heavy duty. I chose the second option. I could also see that even stiffer bilstein with four bars were available but fitted as standard on the W113 chassis which has softer springs (similar chassis but shorter wheelbase and lighter car).
These heavier duty four green bars shocks fitted as standard on the W113 are even not recommended for use in countries with bad roads for the W111 chassis.

This is what makes me say that stonger springs may work best with softer shocks and vice versa, but I was not able to come with a quantified formula.