Going off memory from previous import rod discussions...
No, they don't ALL come from the same factory; there are some very distinct differences between some brands in how they're machined when you compare them up close,
Brad is right, they are different in both dimensions and machining precision. Look at the differences in the web thickness, 0.080" to 0.098"; and the beam widths are different too. NOTE: These dimensions may vary from the same brand with different length rods.
