One is Souryuu from the TV series while the other is Shikinami from Rebuild.
The concept here is to explore the differences between the two Asuka characters. The artist presumes that they would not get along well together, particularly where it concerns Shinji. Neither Rei nor Mari can tell the two apart. 'Lent figure' is a machine translation of 「人形貸して」 meaning 'Lend me the doll'.
