It was revealed in The Scorch Trials that WICKED, in fact, conducted two experiments, each experiment including a different maze. Group B's Maze Trial was extremely similar to the Trial for Group A (the Gladers), with minor differences. The major difference is that, instead of the experiment consisting of all boys until one girl arrived, Group B consisted of all girls until one boy arrived. The members of Group B escaped their Maze three days earlier than their Group A counterparts, suffering fewer casualties and killing more Grievers.
Everything in Group B's trials was the same as Group A's before they escaped. The only difference is that just after the escape, Rachel, Thomas' Group B equivalent, was killed by Beth, because there was no Chuck equivalent to jump in the way and save her like with Thomas.