three things that might help you decide which to build, based on the parts you might have to work with
the first jet has the earliest tail tip, the earliest IR nose fairing, and the unslotted stabs
the second jet has the second tail tip, the slotted stabs,,,and the second IR nose fairing (this one is similar to the first F-4D IR fairing)
also,,,,,these are both with the same unit,,,,,only the name changed
hth
Rex