A good question and one that I'm never quite sure about.
It seems that presets are just a collection of parameters that get input into the modeling software. If the software changes then the effect of those parameters may change.
If a parameters optimal value in 6.01 was 6.0 and is now 3.0 in 6.02, then it seems that 6.01 presets that have the value at 6.0 will no longer be optimized for 6.02. My guess is that refreshing the block that parameter refers to will change it's value from the old 6.0 to the new 3.0.
Yes, I know, use your ears