Others might know for sure, but it would be my guess each bar is the very same except for length.
I am working on a modification to the top grille bar where I take a top bar from a 1954 with the indented CHEVROLET lettering, and carefully weld that into the top bar of a 1950 grille. Fun stuff! If I succeed, it will look like the 1950 grille had the indented lettering.
I would assume they are the same unless someone chimes in.
