I don't know what period of time Sears sold house-brand lever action rifles from both Marlin and Winchester in 30-30, but I remember seeing the Winchester 94s when I was a boy in the 1960s.
All of the Sears branded Marlin 336s that I've seen were the same, or very close, to the standard Marlin branded 336 specs. All of the Sears branded Winchester 94s that I've seen were easy to differentiate for the standard Winchester branded 94 specs because the barrel on the Sears branded rifles extended beyond the end of the magazine tube.
Sears 45, 101.451, 103.450, and 103.451 = Marlin 336
Sears 54, 273.2120, 273.532140, 273.53419, 273.810, and 273.811 = Winchester 94
JEff
