Yes, the bumpers are the same. OR...while they (53 and 54 "car") "may" have different part numbers, I never looked . They (the front) measure the same and fit the 54 (only) wagons the same. The same width, the same bolt hole locations. The rear bumpers are the same for the 54 and 55 wagons. The "cars" too.
Actually so is the "coupe" bumpers (rear also) the same !
Out of the 53, 54 and 55 cars, the only oddball is the 55 (car and wagon) front. It's a little wider than the rest to clear all of the chrome castings that make up the grill sections.
I was told a long time ago...that the C-K dash boards would "not" fit the sedans or the wagons. False. I bought a known..."Commander" dash from a guy that put a later "Golden Hawk" dash into his 53 C-K bodied car. I took a chance and bought it to try to put it into my "Champion" Conestoga.
Went into my blue Conestoga without any problem whatsoever ! No filing, no hammering, no trouble .
So yeah, this means that the Golden "Hawk" dash will also fit the wagons.
The "car" tail light housings...THEY ARE...different from the wagon housings. The wagons (54 and 55) are a taller casting than any of the "car" tail light housings. The lenses too.
Mike