There is no difference between the two other than terminology.
Ukraine
Ukraine
It is a US state named "The Commonwealth of Virginia".
It is a state, and its full name is "The Commonwealth of Kentucky", it is just refered to as Kentucky in common useage.
No. California is a State. Massachusetts is a Commonwealth.
Secretary of State for Commonwealth Affairs was created in 1966.
Secretary of State for Commonwealth Affairs ended in 1968.
Secretary of State for Commonwealth Relations ended in 1966.
Secretary of State for Commonwealth Relations was created in 1947.
Missoouri does NOT style itself a commonwealth.
No. It is a US state, and as such, could not be a member of the Commonwealth.
No Georgia is not one of the four commonwealth states.