@dosnostalgic Is the only difference the brown/dark yellow?
https://en.wikipedia.org/wiki/Enhanced_Graphics_Adapter#Color_palette
"The CGA's alternate brown color is included in the larger palette ... Standard EGA monitors do not support use of the extended color palette in 200-line modes, because the monitor cannot distinguish between being connected to a CGA card or being connected to an EGA card outputting a 200-line mode. "