I can not compare，but i think there is no differents. Passat B6 B7 and CC also made in VW Shanghai factory and 1st.mobile China-VW union.
My Passat B5, 11 years, 140K kilomiter milage, it work well, powerfull.
When I got it，I changed (replaced) the pipe between air filter and turbo(sorry，i don’t know call what), break brake disc, ignition plug , all one-way valve,
And some straw pipes.
it's nice car, but i can't understand why not keep B4 B5 classic style for B6 B7 like Audi A4 A6 A8 A7.