When 7.5-inch and 8-inch cruiser guns are comparable

Can a 7.5-inch gun reasonably be compared with an 8-inch gun?

For 1917-18 the comparison is reasonable, but by 1930 it is no longer a sound equivalence.

A viewer asks whether First World War 7.5-inch guns can reasonably be compared with contemporary 8-inch weapons. The comparison is fair for 1917-18 but no longer valid by 1930. Calibre alone cannot erase the development separating wartime weapons from later cruiser guns. Any comparison therefore needs a specific design period.