1.8/2.0 valves????

I've got a 2.0l block with a 1.8 head on it and it's thrown a conrod. On the replacement engine I've just bought the head has the same part number as my 1.8. Does anyone know if the valves are also the same or any bigger in the head off a 2ltr?

check out the club gti forum they have a guide to all the different heads on there somewhere