Are there ways to tell if a specific bolt and carrier came with a specific model or are all to them just marked with the "C" and  semi-auto?

There are no specific AR bolt carriers for specific model semi-autos, but Colt bolt carriers for ARs have changed in color and design over the years. Earlier bolts and carriers were a lighter grey-green, while current production is black. The earliest bolt carriers were hard chromed and lack notches for the forward assist. Early pre-ban bolt carriers have a short section that is round at the rear, while current Sporter MT type carriers are flat at the bottom to the back.