1954 Ford Park Lamps - different?

[mercman from oz]

While having a cleanup today, I came across this pair of NOS Park Lamps for a 1954 Ford. If you look at picture 5857, you can see that they are identical from this side. However, when I turn them upside down, refer to photo 5858 they have completely different mounting tabs. Did Ford change the design sometime during production? The Part Numbers are printed on the respective boxes.
Can both of these Lamps be used on the same car, or will one have to be exchanged so that it fits the 54 Ford?