In Pokemon Origins both on the Bulbapedia and on Wikipedia there are separate voice actors for Blue, Red, and Green. With Blue being the main character.
On the Bulbapedia for the Manga it also says
A native of Pallet Town, Green was kidnapped by a bird Pokémon when she was only five years old (six years prior to the first chapter), on the orders of the Masked Man. She was taken to a secret hideout and was trained with several other Masked Children. There, she met Silver and learned about Evolution. Eventually, they managed to escape into freedom. Green spent years traveling alone until she discovered she was from Pallet Town, where two boys her age had each received a starter Pokémon, a Pokédex, and set out on a journey. Frustrated, she broke into Professor Oak's laboratory and stole a Squirtle.
Those two boys are Red and Blue so Green is not Blue