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One is 3.73, the other is numerically lower but I'm not sure what ratio it is.
Both have:
6 on 5.5" bolt pattern
drum brakes
mounts for trailing arms (2WD truck donors)
panhard bar mount
IIRC, 62.5" WMS - WMS
no known trouble, personally put miles on the 3.73 with no problems, funny noises or...