Digital BW, The Print

Hey list folks, sorry if this is off topic but perhaps it is not?

I have been using Photoshop CS since it came out to work with RAW files 
from my Canon 10D with great success. I recently downloaded the trial 
version of CS2. When I open up RAW files that I have previously worked 
with in CS1 with the CS2 RAW converter using existing .XMP sidecar 
files the images are rendering in the RAW converter with a LOT more 
contrast and saturation. All the numbers in the slider settings are 
exactly the same as in the original CS1 RAW converter. As an experiment 
I have even opened the same file simultaneously in both CS1 and CS2 RAW 
converter to confirm this.

Does anyone know what is going on here? If I did want to upgrade to CS2 
as things stand, all my previous RAW settings would be useless!

As a side note... If I open the same PSD file in CS1 and CS2 they 
render exactly the same, so the difference is definitely in how the new 
CS2 RAW converter is rendering the RAW file.

Thanks in advance for any thoughts!

- Jeff