I've never compaired the spring hangers on the frame, they could be diffrent also... grab a tape measure, find a truck that's 4x4 and simular to what you want yours to be (same cab/bed, DRW/SRW, 250/350, etc) and park 'em side by side... spend half an hour or more takein' measurements, compairing how stuff will fit...
Quick trip to the local used car lot might do a lot of good... local body shop that has one in for repair might let you check one out... just talkin' to somebody you see at the mall parking lot or next fuel stop could work... and it's a good way to make new powerstoke friends! Tell 'em about the .org!