If swapping prests would not change already assigned colours in a patch then it would be very useful.
I like to work with custom colours and am learning to try to apply them consistently in a patch. It would (hopefully) be less mouse clicks to switch between, say, 3 groups of 4 colours, than scroll through a list of 12, when I am trying to use one set of colours with say, samplers, and another set with, say, VCOs/Synths. Selecting Preset 2 for Samplers would be less confusing than trying to remember that orange comes after mauve in a long sequence.
Hope that makes sense.