If your thinking in terms of merely temperature..Yes its probably somewhat similar..
Only things that are not similar.
1) At 10 degrees, the engine cpu will begin to advance timing due to the extreme cold. At 70 degrees, the cpu shouldnt be advancing or retarding the timing.
2) Even though you have cooler air, you still have the restrictive air intake system on the 10 degree car. So, you will be getting cooler air, but there are still restrictions to impede flow and velocity..
A cold air intake is the way to go.. We always recommend it be the first mod anyone put into their Focus for better performance ..