You didn't repeat the 'equivalent' on the Victory medal. My question then is did their's specify a date viz 1941-1945 or just WW2?
Now I've checked, I find that whereas their Victory Medal is for service in the years 1941-45, and does in fact show those dates, the American Defense Service Medal qualification period includes service in "the limited emergency proclaimed on 8 September 1939 or the unlimited emergency proclaimed on 27 May 1941"
Not sure of the significance of the latter date - maybe someone can clarify.