I got tired of making my roms in FCEUX and then getting different colors in Nestopia.
I really don't like Nestopia and wouldn't use it except it's got the best way to extract stats, this thread is about as close as I have come to figuring out how to successfully extract FCEUX season stats:
Anyway, I made this pallette with the mini helmet screen comparing the two as sort of a guide, the "F" columns and "N" columns mean what you would think.
Thought maybe someone might find it useful.