Backup your originals if you are unsure. I have replaced filter settings many times by overwriting the existing files in the filters folder without any problems.
If you open one with text editor, you can see that they are just simple text files, and they don't link anywhere in your computer,
which means you can safely replace one with another. You could even write one without opening Gimp.
Here's an example of the component-extract, for which I have not created any presets
but it has 3 entries because I have chosen to save 3 last used settings in the preferences.
You don't need to export them from inside Gimp, that would be tedious.
The only exception I can think of, is a filter that was changed/updated with a new setting between 2.10.14 and 2.10.20.
# settings
(GimpGegl-gegl-component-extract-config "2020-05-17 11:07:30"
(time 1589702850)
(component hsv-v)
(invert no)
(linear no))
(GimpGegl-gegl-component-extract-config "2020-05-17 11:07:17"
(time 1589702837)
(component hsv-s)
(invert no)
(linear no))
(GimpGegl-gegl-component-extract-config "2020-05-17 11:07:04"
(time 1589702824)
(component hue)
(invert no)
(linear no))
# end of settings
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Nidhogg! 
