i think in general , it would be better to have the 40 at a longer draw,,but there are always exceptions,, but with hunting arrows yes,,
I know some of the flight bows are shorter draw,,
its gonna depend on the bow wood,, if the 24 inch has no set and the longer draw has set, it may be a wash,, I know it sounds vague, but it is a tricky question,,
in theory,,,,,the longer power stroke will give you more speed,, if the bow is not taking any set,,but like I was telling stickbender the other day,, sometimes the bow dont know the theory,,