Are they both refered to as export braces?
References can vary based on personal preference, but we should take note of the Ford terminology. Here the basic part numbers are 16A052 and 16A053, and the term used is "Brace - Front Fender Apron to Dash". See the referenced picture for documentation.
As an aside, if you are ever searching for the Ford basic part number, take a look at the NPD numbers. NPD uses the Ford basic part number (only, not the full part number) for their Mustang parts. Perhaps other Ford parts as well, but I can speak to the Mustang parts.