I’ve been playing some games through ScummVM, and there’s a cool feature that lets you load the game using whichever graphics mode the software originally supported. It also lets you use shaders to simulate a CRT, because these bare pixels were never meant to be seen with human eyes. I thought it was fun to compare the art from the different versions.
The posted image is from the EGA version
Here is the CGA:
And Here is Hercules(Amber):
I think that bad CGA palette comes from quick & dirty VGA conversions. This was probably near enough to the changeover to EGA that it was worth doing a good job because there were still quite a few people still using CGA.
Just a guess though.