No they are different.
The modifier color is mentioned first and then the dominant color. For example, pink brown is more brown and brown pink is more pink.
Fancy colour diamonds come in almost any colour you can imagine. Red, green, purple and orange are generally the rarest, followed by pink and blue. Yellows and browns are the most common fancy colours, but they’re generally less valuable than the rarer colours.
Diamonds in the normal color range are colorless through light yellow. Fancy Colored Diamonds, on the other hand are yellow & brown diamonds that exhibit different colors.
www.gia.edu
One last link that explains using the ish as the suffix...for example brown vs brownish as those are different too.