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Clearly there is more to consider than just a single height measurement being a little off. As Pawel points out, both these containers represent a civilian ISO spec product, NOT military.
The US military buys standard ISO containers. They simply exercise some options that others don't. (This does not apply to shelters or BICON/TRICON/QUADCON containers.) From the container inspection Standard:
"The most common type of freight container is the general purpose dry cargo type. This container completely encloses its contents by permanent steel structures and provides cargo loading access through end opening doors.
"Typical end opening steel containers can be 10, 20, 40, or 45 feet long by 8, 8-1/2, or 9 1/2 feet high. The standard width of an ISO container is 8 feet. The walls of a typical steel container are usually constructed of corrugated sheet steel panels that are welded to the main structural steel top and bottom side rails and end frames. The end frames are fitted with standard corner fittings (steel castings) at all eight corners that are welded to the four corner posts, top and bottom side and front rails, and rear door sill and header. The roof is usually constructed of either flat or corrugated sheet steel panels welded to the top side and end rails and door header and may have roof bows for support. The doors are usually either shaped steel frame with steel panels or plymetal (steel faced wood) panels fitted with locking and anti-rack hardware and weather-proof seals (gaskets). The flooring may be soft or hard laminated woods, planking, plywood, or composition material either screwed or bolted to the floor cross members. The floor cross members may be box, C, Z, or I shaped steel beams bolted or welded to the bottom side rails. Some containers are configured with all-steel flooring or a combination of wood and steel.
"An ISO freight container is primarily handled via connection with its internationally standard corner fittings; however, many steel containers are also provided with empty and/or loaded capacity forklift pockets to improve container handling versatility. Performance specifications for a typical 20 foot long end opening steel container are provided by commercial item description A-A-52032."
That CID was recently replaced by A-A-59272 which covers 1C containers with “PROPERTY OF U.S. ARMY” stenciled or letter decaled on each side wall, a minimum of 6 inches high. The exterior finish color is lusterless desert tan with an interior finish color of light gray. The 1CC containers under the old CID used 3 inch high lettering with a 8 x 12 US flag on each side.They were color 33446 or as ordered and could be light gray or white on the inside.
For a model, about the only visible thing that a military container has that a basic commercial container doesn't are the empty and loaded forklift pockets. None of the specifications require any specific corrugation pattern for the sides or doors. (The top has to be corrugated, though, not flat.)
KL
