Male on right, female left? I feel sure about the male: concave plastron, long tail. The other isn't so clear to me. That one is shallow concave, but the cloaca seems to be near end of tale.
Right one is obviously a male as you have stated before. The left one, if I had to guess, is a male as well... Concave plastron, medium sized tail... But honestly I'm not very good at sexing...