There will be, slight, differences across sites/applications. I advise you to read the color balance section of the darktable tutorial.
Here’s a quote that might be of interest to you:
During the HSL to RGB conversion, the HSL lightness is always assumed to be 50%, so the RGB parameters are always balanced to avoid lightness changes. However, during the RGB to HSL conversion, the HSL lightness is not corrected.
I’m assuming you have, but just to make sure: Also have a look at Boris Hajdukovic’s (he’s on pixl.us: @s7habo) color balance only Editing moment. My little experiment was basically inspired by that video and in time other stuff fell into place to make me actually try it myself.
I’m glad to find out that people find this helpful.