Nah, it's not overly critical, and there's a reason the three founding members of SAS have similar color schemes. At some point, I'll probably cover their backgrounds a bit in the comic, but it's not a spoiler if I just tell you here. (More than likely, Savunn will cover the topic in either her blog or her MySpace page, where she'll soon be having cross-dimensional conversations with Harold in her Comments section. These sites will help to flesh out her world, and hopefully encourage reader comments and interaction.)
The Brooder, as his secret identity, owns a multi-billion dollar tech company. The Riveter is a tech wiz and, as her secret identity, works for the Brooder's company. She's the one who designs most of the Brooder's gadgets, as well as the tech for SAS. So, she designed both the Brooder's armor and her tech suit, and used similar materials for both, hence the similar colors.
Captain Stupendous used to wear a garish, brightly colored costume designed by his mother. However, when Alanna Alliteration and the press started reporting on Stupendous, they made a few comments about his costume and how the Brooder was the sexiest superhero. Being somewhat vain--not to mention wanting to impress Alanna--Stupendous asked the Riveter to redesign his costume into something sleeker and sexier. At this point, the three heroes had already begun to put SAS together, and the Riveter thought that the founding members should have a somewhat cohesive color scheme, and thus you have the costumes for the three heroes as revealed on page 11.