I always do cooked for rice 1 tablespoon-10 carbs For pasta I use dried weights as I tend to cook an exact amount specifically for me. Rice is usually shared between me and hubby.
It depends how the carb contents are defined.
Often, this requires careful reading of the packet as it can make a large difference - for example, 100g of raw rice will absorb a lot of water which will mean it will weight much more once cooked so the percentage of carbs will be less (it does not gain any carbs n the process and the amount "leaked" into the cooking water is negligible),
I tend to use an app to tell me (either cooked or raw is usually listed) and go from there - favourite at the moment is MyFitnessPal but there are others that do the same thing.
Cooked tends to be easier as cooking for 2, so not exactly sure until it hits the plate
The Carb amounts don't change with cooking - speed of absorption can alter (GI) but generally the carbs themselves are fixed in the foodstuff.