Between a Highboy and a non-HB cab: what are the differneces in measurements?

I know the HB very rearward most cab mounts are outside the frame rails and all the other regular cabs are inside the rails, but where the two differences in the rail widths are concerned, are the HB cab holes in the same location as the non-HB cabs? If you were to find a non-HB cab and wanted to mount it on the HB frame, do you have to drill holes thru the cab mounting area to fasten it down?

And also if you find a non-HB body, namely the bed, how much wider are the bed bolt holes than a HB? I have a HB chassis here so I can measure those all day long but dont have any way to get numbers off a non-HB bed.

 

There's a 4" difference.

The highboy frame width is 34" from front to rear.

The non-highboy frames are 34" up front and widen out to 38" from the back of the cab rearward.

When swapping highboy cabs/beds with non-highboy cabs/beds just redrill the mounting holes accordingly (either 2" inward or 2" outward).