The relationship between these different references has not been positively identified. Major Differences USN H1-H3 had a bulkhead between the Torpedo Compartment and the Forward Battery, the Design 602 boats did not have this bulkhead. 20-E had no bulkhead between The Control Room and the After Battery. The bow configuration in CC2 allowed for finer lines giving her a speed advantage of about 1-1.5 kts.
All references give the same tonnage for both boats.
A description of these differences prepared by the Naval Intelligence Office is available in correspondence held by the National Archives of Canada. 8 cyl 480 hp engines in 1918. USN H1-H3 were renamed in Nov 1911 when they were still on the stocks. The bowcap allowed firing two, diagonally opposite, torpedoes in rapid succession. USN H1-h3 originally carried 4 reloads on the deck.