You asked are the axles the same. Had you asked are the drums the same I would have told you drums were the same from '40-50 then changed and were the same from '51-59. Again, Hollander is my reference. Sounds like the seller has the earlier drums.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.