These are some of the parameters which may have had their “behavior” changed with respect to the values applied.
Previous downsample Blur values of 100 are equivalent to either 30 or 33 now.
Post CRT Brightness of 143 is equivalent to 1.43 now.
Halation might have been changed a few times as well as bugs fixed. So depending on how old the preset is a halation value of 0.15 might be equivalent to somewhere between 0.01 and 0.03.
Things like Scanline Gamma Offset no longer exist. Now we have Scanline Gamma in its place.
Then there were the changes to the base presets themselves with the addition of the SMOOTH-ADV base preset and some recent changes to base preset defaults, which might affect shader presets which don’t have those values explicity set.
One example of this is Opposite Dir Multiplier. If you didn’t set it explicitly in your preset, it’s now going to be 125 instead of 100. Which means a change in Scanline count.
Then there’s the Deconvergence Noise that was decoupled from the Deconvergence and given a new toggle. So that would probably have to be toggled On and a new preset saved.
That goes for Deconvergence too. It has an On/Off Toggle.