As I recall, the group of kids in Legends of the Legion were all designed by Todd Nauck to look like members of the Substitutes.
I believe they were meant to homages more than the reboots, especially seeing as how the try-out issue (Legionnaires #43) had already come out with Night Girl being repeatedly used in that issue along with Polar Boy. Heck, they even showed up again in Legionnaires #49, elluding to having formed their own group of "poor substitutes."
Color Kid, Chlorophyll Kid, and Stone Boy all showed up in the background as well during the try-out issue, or at least individuals who look like them. The cover to that try-out issue also featured Infectious Lass and Antennae Boy somewhere in the background, both of whom also had 'Sub children' counterparts in the Legends story.