According with her twin sister
Cynthia Daniel in an interview during the times of
Sweet Valley High (1994), Cynthia was in real life more like Jessica Wakefield (Brittany's character in the TV Series), while Brittany was more like Liz in real life (Cynthia's character in the TV Series). Curiously, in the TV Series Liz was 4 minutes older than Jessica, opposite than in real life (Brittany is 5 minutes older than Cynthia).