Yes, this is 100% correct. Furthermore RGBW is a 4 channels and RGBWW is a 5 channels dimmers.
For some reason neither driver I was tried except for the advanced one designed by @jtp10181
does not provide individual per channel control forcing users always to use color settings.
In many cases this is OK but having individual control per channels opens up a lot of side
possibilities. Very good example is your specific case.
Pair of ZEN17 will do the job but they are too big.
Single ZEN31 is very small and it will be a 4 dimmers instead of 4 On/Off relays.
BTW, all my lights are dimmable and controlled by dimmers regardless where they are installed.
