The motors are a bit different. The other one has a long shaft with keyhole and the other one a short shaft with teeth. Both have a Subaru motor plate on them and some sort of an adapter which can hopefully be modified to fit the Citroën flywheel. Good times.
Edit: Apparently these motors were not used in any production Elcats. They were just prototypes. I wonder why they weren't chosen? Let me know if you have more information. Continous 60 minutes kW rating seems a little less than in production specs, but on the other hand max rpm is higher at 8000.