Just some numbers that may be of interest:
16:59.2 - Holly Barker at Laguna Hills
15:59.9 - Sadie Engelhardt at Cool Breeze
Twenty girls that raced at both races: Diff = time difference in seconds
Laguna - Cool Bz -- Diff --- Girl Runner
20:30.5 - 19:40.7 -- 49.8 --- Amelia Kang - 12 - St. Margaret's Episcopal
20:32.0 - 19:27.7 -- 64.3 --- Sarah Bendzick - 9 - St. Margaret's Episcopal
21:09.3 - 20:17.7 -- 51.6 --- Coco Johnson - 9 - St. Margaret's Episcopal
21:27.5 - 19:57.8 -- 89.7 --- Ali Botuchis - 11 - St. Margaret's Episcopal
21:38.9 - 20:50.4 -- 48.5 --- Maddie Bendzick - 11 - St. Margaret's Episcopal
22:17.9 - 21:00.4 -- 77.5 --- Emma Noriega - 12 - Rancho Verde (SS)
22:31.5 - 21:05.5 -- 86.0 --- Alyssa Rangel Esparza - 12 - Rancho Verde (SS)
18:44.5 - 18:11.2 -- 33.3 --- Isabel Rosales - 10 - Murrieta Valley (SS)
20:19.4 - 19:15.8 -- 63.6 --- Josephine Bennetts - 12 - Murrieta Valley (SS)
20:55.2 - 19:22.1 -- 93.1 --- Hannah Butler - 12 - Murrieta Valley (SS)
21:01.0 - 20:12.3 -- 48.7 --- Ashley Glenn - 12 - Murrieta Valley (SS)
21:11.7 - 20:09.9 -- 61.8 --- Kyana Cook - 12 - Murrieta Valley (SS)
21:57.0 - 20:04.3 -- 112.7 -- Kaiya Archard - 11 - Murrieta Valley (SS)
22:51.1 - 20:09.8 -- 161.3 -- Madison Decker - 12 - Murrieta Valley (SS)
22:28.0 - 20:31.3 -- 116.7 -- Lexi Wynne - 12 - Tesoro (SS)
21:12.5 - 19:08.5 -- 124.0 -- Margaret Moffitt - 10 - Woodbridge (SS)
21:54.6 - 20:48.6 -- 66.0 --- Brooke Welton - 11 - Woodbridge (SS)
22:18.5 - 20:03.5 -- 135.0 -- Mia Washida - 12 - Woodbridge (SS)
22:52.5 - 21:07.7 -- 104.8 -- Safaa Al Maubasher - 12 - Woodbridge (SS)
23:52.3 - 21:07.6 -- 164.7 -- Samantha Trimmer - 12 - Woodbridge (SS)
Median = 81.75 seconds faster at Cool Breeze
Average = 87.66 seconds faster at Cool Breeze
Throwing out possible outliers (too much of a difference):
Median = 60 - 63 seconds faster at Cool Breeze
And Both race distances are miles (supposedly).