That’s Julia on the left. more nose less chin. That’s Liz on the right. They do not look identical side by side, but it still isn’t a giant difference one on one. I don’t think anyone will guess the Twin Twist. Jason might if he actually interacted with her, but he doesn’t. No one pays her enough attention to notice. What is going to trip them up is the fact that they are not debriefing each other very well. They all think Liz is a liar, when in fact Julia doesn’t know what Liz has done half the time.
In case you missed the Twin Twist in Season 5: