They have different part numbers, cannot tell you if they will interchange. I assume you are talking about the part that mounts on the tractor the wide front pivots on.
 
A 460 is a narrow frame tractor 18 inches outside to outside at the channels beside the engine, same as an H and 300. The M, 560, 706 up through the 56 series are wide frame 20 inches O to O. Not sure which the 504 is.
 
460 and 560 use the same size bolsters. Frame rails widen on a 460 from clutch housing forward. Think the 504 has differences from what I remember. 504 frame rails bolted to outside of clutch housing but can't remember checking width.
 

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