What's the difference in cubic ft. of a same-year Chevy Silverado PU Cabin

[Tim]

4-door to a 2-door, If any? For the sake of time it takes for the air-conditioning to condition the air in the cabin of a Chevrolet Silverado pickup truck (new, between 2004ish to present), I would like to know if there is a difference in cubic feet (or whatever measurements are used) between a 4-door and a 2-door.
I've looked around fairly extensively, but have yet to find an answer. Any help would be appreciated.