Differences bewteen Thiel CS2.3 and CS2.4

Has anyone ever compared these two side by side? What are the main differences when it comes to the sound?
See the thread started by Robk on 5/2/04 for some interesting comments comparing Thiel CS2.3 and CS2.4. Thread is titled "Aerial 7B vs Thiel 2.4". You can search this thread or else search it under discussions on Thiel speakers. One of the participants (Exertfluffer) has heard both models.