So with the Fender Apron having a January 14th stamped date (Michigan Mfg) does that fall in line with the Jan 28th. (San Jose) Date ?
There is no rule when it comes to this. The scheduled build date of the car was a guess and could be off as much as days/weeks in either direction. It takes a thorough examination of the car to help narrow down the actual build date, but without records from Ford, we would never know for sure.
Generally, it would be expected that any parts on the car would pre-date the actual assembly date by a few days to a few weeks. Sometimes longer, but typically not more than a couple months.
Unfortunately, these vague qualifiers have to be used in this context because we simply cannot say for sure. We can only observe what we find on original cars to help with these questions.