Its something we'll never get sick of looking at "Photos like these"
Reading into their lives is a good past time.
Check out how the centres of both bars are weathered and the sides ,in particular the lefts arent ,Maybe caused by the wind deflection ,The parking position during their lives ,A difference in chrome quality from factory possibly chromed in different locations or processes, or maybe sourced from other vehicles with different circumstances at some stage.
Look at the mould formed on the roof of the near FC and on no other panels - roof may have been under a tarp, Iwas informed that this mould grows about 1cm every year so gives a good indication of age.
What about how the grille only has one rusted bar ?
T try not to look at things in too much detail but I cant help myself ,I realy realy get off on it