From Chapelle's History of th eAmerican Sailing Navy:
Constitution, President, and United Staes were 44 gun frigates, built form the same plans. So, they were sisterships. The ships were built in 3 different yards in 3 different ports, with construction overseen by three different captains. The captains had a lot of influence in the rigging and arming of the ships, so there were many minor differences in the way the ships were fitted out.
Congress, COnstellation, and CHesapeake were 38 gun frigates, and not sisters of the Constitution class.
-Bill