How wartime-built Tribals differed from prewar ships

How close were wartime-built Tribal destroyers to the prewar design?

They were very similar; the main differences lay in armament, including anti-aircraft-oriented fits on some ships.

The wartime-built ships were nearly identical to the prewar Tribals. The principal changes concerned weapons fit, including variants configured more strongly for anti-aircraft work. Armament, rather than hull form, provides the main recognition difference.