yes, they are largely identical....
you will need to reuse the center block however since the front diff won't have it...this keeps your rear axles/c clips in place.
68-newer diffs from a 40-45-55-60-62 will all have the same side gear splines and are interchangable.
Make sure you check gear ratios....your 75 should be 4.11.
Driveshaft bolt patterns vary some....your input flange is coarse spline and will interchange with any other coarse spline diff, but tha'ts only from 1977-older. If you end up with a newer fine spline pinion, you'll likely need to source a different flange for the d-shaft.
Easiest to find would be 1968-77 and drop it in.