Insectoids combines two trends of Classic Space minifigure design. They come in two different colours (or rather colour combinations) like the first ones, that had five, Also, they have a "leader" with a slightly different design and printing on legs or helmet, like in 90s themes. Though giving each "character" a different torso started with Exploriens and androids with Spyrius.
What's more, its seems that neon green helmets pilot flying vehicles while darker green ones do ground vehicles.
Even cockpits seem to have properties depending on the color. Trans-green ones rear windows, perhaps related to powerorb storage, and neon ones are actual piloting cockpits.