Brake Line Distribution block port sizes are different

I may not have explained myself correctly. My concern is with the original distribution block- where the brake lines branch to the left & right front wheel cylinders & then to the rear tee- not the master cylinder. 1 port on the distribution block appears smaller than the other 2.I also noticed on the rear Tee that those ports for the inverted flares were the same size as the 1 different flare inlet/ outlet/ port /hole size.