The Canadian issues are shifted up by two (#4, reprints U.S. #2 etc); with Canadian issue #8 switching to Vol.2 (reprinting U.S. #6); hence, vol. 2 #9 is a reprint of U.S. Vol. 2 #1; the final issues for both series (The Canadian edition had limited distribution within U.K).
The U.S. covers to #2 and #3, by Jack Cole were redrawn with violence lessened; the remaining Alval issues reuse their corresponding U.S. covers.
Both countries had 'True Crime' magazines, but these are unconnected to comics series, except visually (both U.S. series came from the same publishing house); the missing early numbers are unaccounted for.