What is the difference between a 2003 honda shadow 600 and 650?

What are the differences between a 2003 honda shadow 600 and 650, I can't find any info anywhere! Besides actually engine size what is different? Are the frames different? Are the internals to the engine different in the 650? Any light shed on this would be very helpful!

http://en.wikipedia.org/...nda_VT600C
As far as I can find, there's no such thing as a Shadow 650.