Most of the AMs are pretty consistent in their respective colors, however, I've noticed the green AMs tend to come in more of a variety of shades of green: some are Kermit green, some are more minty green, some are lime, some even come in a more yellowish version of Kermit green.
Then again, in more recent years, the mini pink AMs can either come in their traditional shade of pink, hot pink, or magenta.