Looking at the new Holland parts lookup site, the 601 heavy Duty front axles did look pretty much the same as the regular front axle, and it just lists the parts numbers separately with the descriptions changed to say "Heavy Duty". It lists separate part numbers and descriptions for the following parts:
Left hand axle assembly
Right hand axle assembly
Center axle assembly
Front Axle Pivot Pin
Pivot Pin Bushing
Front Axle Pivot Pin Locating Flange
Left Hand Spindle Assembly
Right Hand Spindle Assembly
Spindle Bushing
Spindle Bearing
So basically everything in the front axle itself except for the steering linkage parts at the tops of the spindles. I assume that the main left, center and right axle assemblies are different to accommodate the heavier duty spindles, bushings, bearings and pivot pin.
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